# Answers to General Maths Exam (1 Viewer)

#### pattii

##### condom endorser
HEY PC!!!
I think you misinterpreted the question...

#### blackall46

##### Member
pattii said:
HEY PC!!!
I think you misinterpreted the question...
yeah for b ii

you had to find value of d (the lightbulb one) and you had to answer with \$d as one lightbulb. not four.

i got something like 0.184 i think dont remember

#### pattii

##### condom endorser
nah i was talking about a)

#### innocentmel

##### New Member
Number 3 is a trick question....
I realise this now.
I said A but they were asking for his TOTAL pay for the 4 weeks guys...
Hope this helps.

#### PC

##### Member
blackall46 said:
yeah for b ii you had to find value of d (the lightbulb one) and you had to answer with \$d as one lightbulb. not four.
For (i): There are four light globes. They each cost \$6 to buy and \$d per hour to run. So the cost to run one of them is 6 + d x 5 x 365 = 6 + 1825d. Therefore the cost of running four of them is 4(6 + 1825d) = 24 + 7300d.

For (ii): The total cost of running all four globes for a year is \$250. Therefore:
24 + 7300d = 250
7300d = 226
d = 0.031

This question would be much better if it just focussed on one light bulb rather than four.

#### haynze

##### New Member
QUESTION 24
(a) (i) 11.4
(ii) Removing the outlier will decrease the mean but the median will stay the same.
(b) 3.6 sec
(c) (i) €480

Wouldnt the gradient increase because the australian dollar would buy more euros now e.g it would get closer to the us dollar line

#### PC

##### Member
haynze said:
QUESTION 24
(a) (i) 11.4
(ii) Removing the outlier will decrease the mean but the median will stay the same.
(b) 3.6 sec
(c) (i) €480

Wouldnt the gradient increase because the australian dollar would buy more euros now e.g it would get closer to the us dollar line
Yep.

Hey that's a great answer too!

#### tani90

##### New Member
QUESTION 26

(c) Total value = 100(1.06)21 + 100[ (1.06)21 – 1 / 0.06] = \$4339.23

..... i thought it was suppossed to be to the power of 22, because it was her birth and then 21 birthdays, am i wrong?

#### williams180

##### Member
tani90 said:
QUESTION 26

(c) Total value = 100(1.06)21 + 100[ (1.06)21 – 1 / 0.06] = \$4339.23

..... i thought it was suppossed to be to the power of 22, because it was her birth and then 21 birthdays, am i wrong?
i did 21 but either way if you did 22 and rest on answer was right you will get 3/4

#### Hamil

##### New Member
Question 5 MC

Answer is actually D as they ask you for a trinagular pyramid not a trinagular prism.

Question 6 MC

22.00 / 100 = 0.22

0.22 x 10 = \$2.20

Question 9 MC

I think the answer is B. A population of 500,000 may only have 10 schools. \$1 of petrol may provide you with 0.90L.

Question 23 b) iii)

V=Ah

V=400 x 0.02

V=8L

Question 27 a) iv)

Dimensions are actually Length = 15m Width = 9m hence 15mx9m

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#### MyLoveIsPure

##### Member
AlexW23 said:
You get paid for the holidays, and you also get 17.5% extra for going on holidays.

Weird I know, but thats how it works.
for that question, was the answer (4 x weakly wage) + (17.5% x 4 weeks wage)?

#### nod089

##### Member
Hamil said:
Question 6 MC

22.00 / 100 = 0.22

0.22 x 10 = \$2.20
Wrong mate.. Original cost was \$20. GST=10% of original price ie- \$2.00

#### nod089

##### Member
williams180 said:
i did 21 but either way if you did 22 and rest on answer was right you will get 3/4
It's definately 22, as she gets a payment the day she was born.

#### nod089

##### Member
Tom2nv said:
But doesnt \$1316 sound strange as he is not working yet he is receiving more money in the 4 weeks than if he had been working the 4 weeks
It is like a fringe benefit.

#### MyLoveIsPure

##### Member
nod089 said:
It is like a fringe benefit.
yeh, its just one of the benefits for being employed full time

#### Magicana

##### Member
Hamil said:
Question 5 MC

Answer is actually D as they ask you for a trinagular pyramid not a trinagular prism.

Question 6 MC

22.00 / 100 = 0.22

0.22 x 10 = \$2.20

Question 9 MC

I think the answer is B. A population of 500,000 may only have 10 schools. \$1 of petrol may provide you with 0.90L.

Question 23 b) iii)

V=Ah

V=400 x 0.02

V=8L

Question 27 a) iv)

Dimensions are actually Length = 15m Width = 9m hence 15mx9m
Q5 MC - Cannot be D, as diagram I is the stock standard net for a triangular pyramid.

Q6 MC - Already prooven wrong.

Q9 MC - I think this is a very bad question. None of them are necessarily right, as the population of a city means little to how many schools it has - it is the number of children that determines that, so birth rate to schools would be better.

23. B. III.

What I did was convert it all to MM, like so:

400 * 100 * 10 (Or 1000, whatever tickles your fancy - just showing you the step).

So 400,000 mm * 20. That equals 8,000,000. Divide it back into the original volume shown, in m. That comes to 8,000. 1m^3 is equal to 1L, so it is 8,000L. Always try and deal in the same unit of measurement, even if it requires bigger numbers than before. You can always put it back in, and you will get the right answer.

Q27 - Correct. It is 15 by 9. I got that from using the graph then my own astounding mathematical knowledge to minus 6 from 15 :rofl:.

#### Bayley

##### New Member
this probably sounds really stupid but how did u get A for ques 6 ... i got B

#### Magicana

##### Member
Bayley said:
this probably sounds really stupid but how did u get A for ques 6 ... i got B
Well the amount that it costs is \$22, which is 110% of the original price. Timse that by 100, then divide by 110, and you get the original price, which is 20. Then just do 22-20. . You must have done something like 22 * 10 / 100, which would equal 2.2. Hope that helped.

#### PC

##### Member
Der Waffen SS said:
Q9 MC - I think this is a very bad question. None of them are necessarily right, as the population of a city means little to how many schools it has - it is the number of children that determines that, so birth rate to schools would be better.
Agreed. Definitely not a good question. The two words which a lot of people may have glossed over in the question are most likely. When I first saw the question I thought it was B as well, but only because I thought they were talking about petrol sales. As the price goes up, the sales will increase as well. The number of litres would probably stay the same or decrease a little so B is probably not a case of positive correlation. In the case of A, just because a population increases doesn't mean the number of schools would increase, but you would expect that it would. So A is more likely to give a positive correlation than B.

Der Waffen SS said:
23. B. III.

What I did was convert it all to MM, like so:

400 * 100 * 10 (Or 1000, whatever tickles your fancy - just showing you the step).

So 400,000 mm * 20. That equals 8,000,000. Divide it back into the original volume shown, in m. That comes to 8,000. 1m^3 is equal to 1L, so it is 8,000L. Always try and deal in the same unit of measurement, even if it requires bigger numbers than before. You can always put it back in, and you will get the right answer.
You mean 1 m3 = 1 kL?

I did 400 x 0.02 = 8, but this is 8 m3, so 8 kL, which is 8000 L.

Der Waffen SS said:
Q27 - Correct. It is 15 by 9. I got that from using the graph then my own astounding mathematical knowledge to minus 6 from 15 :rofl:.
Yes. Sorry about that. I was answering the paper and typing in the answers at the same time. I just typed the last answer which was the 9 m width. Fixed that up now. Thanks.

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#### RaisedByWolves

##### Member
Bayley said:
this probably sounds really stupid but how did u get A for ques 6 ... i got B
Easiest way to get GST is divide the sale price by 1.1
so 22/1.1 = 20
then take that value away from the sale price
22-20 = 2