-
Best of luck to the class of 2025 for their HSC exams. You got this! Let us know your thoughts on the HSC exams here
2012 Year 9 &10 Mathematics Marathon (1 Viewer)
- Thread starter TerenceM
- Start date
Re: 2012 Year 9 &10 Mathematics Marathon
\times 100}{2}\\=101 \times 50\\=5050)
learnt that long time ago
(i hv seen this question in a yr 7 paper btw)
learnt that long time ago
(i hv seen this question in a yr 7 paper btw)
Re: 2012 Year 9 &10 Mathematics Marathon
For the benefit of more year 9 and 10 students here's a more moderate one for you guys:
An empty diving pool is in the shape of a rectangular prism, 6 metres long and 4 metres wide. Water is flowing into the pool at a rate of 800 litres per hour. What is the depth of the water after 5 hours?
NB: ymcaec, this would be too easy for you. Let some other people have a go.
For the benefit of more year 9 and 10 students here's a more moderate one for you guys:
An empty diving pool is in the shape of a rectangular prism, 6 metres long and 4 metres wide. Water is flowing into the pool at a rate of 800 litres per hour. What is the depth of the water after 5 hours?
NB: ymcaec, this would be too easy for you. Let some other people have a go.
Re: 2012 Year 9 &10 Mathematics Marathon
=800x5
=4000L
let a be height/depth
Volume of diving pool
=6x4xa
=24a m^3
=24000a L
equate: 24000a = 4000
a= 1/6 m
Water after 5 hours
=800x5
=4000L
let a be height/depth
Volume of diving pool
=6x4xa
=24a m^3
=24000a L
equate: 24000a = 4000
a= 1/6 m
domain for x?
SpiralFlex
Well-Known Member
- Joined
- Dec 18, 2010
- Messages
- 6,954
- Gender
- Female
- HSC
- N/A
Re: 2012 Year 9 &10 Mathematics Marathon
Who here would like to do a Spiral exam?
Who here would like to do a Spiral exam?
Re: 2012 Year 9 &10 Mathematics Marathon
Here's another one:
Peter stands due south of a pole. Sam stands 10m due east of Peter. The angle of elevations of Peter and Sam to the top of the pole is 25(degrees) and 15(degrees) respectively. Find the height of the Pole.
Here's another one:
Peter stands due south of a pole. Sam stands 10m due east of Peter. The angle of elevations of Peter and Sam to the top of the pole is 25(degrees) and 15(degrees) respectively. Find the height of the Pole.
kev-kun
Member
Re: 2012 Year 9 &10 Mathematics Marathon
Sorry that I didn't see this Q earlier. After about 3/4 of a page of working, I had 3.27 metres. I treated the length of P to the pole as 7.02 (2 d.p.).I got 3.27 for that one. How did you do it?
kev-kun
Member
Re: 2012 Year 9 &10 Mathematics Marathon
Lol probably because I used dp's too early == yeah did it again got the same
Re: 2012 Year 9 &10 Mathematics Marathon
When you do problem solving, think this: 'I have all this given information and thus I will record it but what do I need?'
Nah, don't worry too much about it. Never get thrown off by a question simply because it seems new to you. Make an effort to interpret it. If it doesn't hit you, take a break, have fun and relax and get back to the question once your mind is refreshed. Often, the human mind takes longer to comprehend things at times so it's perfectly normal not to get it the first time around.
When you do problem solving, think this: 'I have all this given information and thus I will record it but what do I need?'