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2nd Sep 2011, 15:53

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ReverseFlight

Join Date: Nov 2007

Location: Yellow Brick Road

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A look at VFE's post shows that you do not use conventional methods to solve these problems i.e. do not try any long multiplication or division.

For example, 0.5 x 0.999999 is resolved as 0.5 x (1-0.000001) which becomes (0.5 - 0.0000005) etc and you don't need a calculator for that. Likewise (9.999 x 1/9) is immediately resolved as 1.111

Quote:

You fly west for 600 miles and then north for 800 miles

You immediately recognise that's Pythagoras and the 2 shorter sides have been multiplied by 200 times, so the answer is 1000. Bingo.

I'm no maths wiz but you just need to think laterally with these type of questions. Good luck to all.

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