Primary Maths Challenge
Moderators: Section Moderators, Forum Moderators
Ok, I asked my OH, and I think I've got it....Milla wrote:cor, well done! I don't think we do these - and wouldn't if did, if you get what I mean. Very difficult!!
I looked at one, the paper from November 2008, and there was one which I couldn't work out at all: question 25, the water in the tank one:
http://m-a.org.uk/resources/Paper_Feb2008.pdf
if anyone can explain it in words of one syllable, I'd be grateful!
Congrats again.
Tank 1 and tank 2 are linked
So the surface area is (80 x 80) + (60 x 60) = 10,000cm2
You add 100l of oil
1ml = 1cm3, so 1l = 1000cm3, so 100l = 100,000cm3
100,000cm3 / 10,000cm2 = 10cm
.....oil....... ........area... .....depth...
The oil inboth tanks will rise by 10 cm, the fact that one is smaller than the other makes no difference as the oil will settle at the same depth in both tanks.
[url=http://www.TickerFactory.com/]
[img]http://tickers.TickerFactory.com/ezt/d/4;10100;430/st/20100902/e/DD+Starts+Senior+School/dt/5/k/bbdb/event.png[/img]
[img]http://tickers.TickerFactory.com/ezt/d/4;10100;430/st/20100902/e/DD+Starts+Senior+School/dt/5/k/bbdb/event.png[/img]