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 Post subject: Maths
PostPosted: Thu May 07, 2009 11:10 am 
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Joined: Mon Mar 16, 2009 1:31 pm
Posts: 182
Hi !

Wondering if anyone can solve this problem for me, the answer is simple but somehoe I can't see it..

Petrol tank is 3/4 full.After 75 litres have been drawn off it is 3/5 full.
What is the capacity of the tank?

I don't think it is worded very well so if someone can help it would really be appreciated.

Regards,

FTM :?:


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PostPosted: Thu May 07, 2009 11:17 am 
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Joined: Wed May 09, 2007 2:09 pm
Posts: 875
Location: Solihull, West Midlands
Think of the tank divided into 20ths

3/4 is 15/20

3/5 is 12/20

The difference is 3/20 - which equates to the 75 litres

So 1/20 of the tank is 25 litres

So the tank is 500 litres (20X25)


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PostPosted: Thu May 07, 2009 6:32 pm 
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Joined: Mon Mar 16, 2009 1:31 pm
Posts: 182
Thanks for that ! To think I did A LEVEL Maths and did well in it!! Sometimes even the simple things can confuse you. Thankyou really appreciate the answer.

Regards,

FTM


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PostPosted: Sat May 09, 2009 10:11 am 
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Joined: Sat May 17, 2008 8:37 am
Posts: 111
I got the same answer but in a different way.

3/4 = 75%
3/5 = 60%

This drop of 15% is 75 litres.

Find 1% of the tank (75/15) = 5

The full tank is therefore 5 x 100 = 500 litres.

Rose Petal


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