for 30a)ii) i had 0.4(20000w^3)
, i think your one misses out the 20000 and ^3
sorry i can't remember what iii and iv were (the questions) :/ and i got 33%
not 133%, because if it was over 100% it would of meant that it would double... which i don't think it did...
um and i think shaziee7's
between 17.5 x 25.5 and 16.5 x 24.5.
(because its both the upper and lower areas)
Can anyone explain the very last question?
i'll try... :/
4.1/41= 0.1 (so that means there is 0.1 litres of oil left and 40x0.1 (4 litres) of petrol)
So now we need to get it down to 25:1 instead of 40:1
So 4 litres of the 4.1 left are petrol, so we need to get this 0.1 of oil to equal 1/25= 4%
So 4% of 4 litres = 0.16
0.16-0.1= 0.06 litres of oil to be added
. and I THINK thats the answer...
hope that helps...