bpp p&r kit sep 2015 -august 2016 q20.4

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October 17, 2016 at 4:02 pm #344349
caoimhin23
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Hi

Having trouble understanding the answer = 1.25

I would have thought it would be 1 * 1.20= 1.20?
October 18, 2016 at 8:04 am #344547
John Moffat
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For every 100 litres of input, 20 litres will be lost and therefore only 80 litres will be produced.

Putting it the other way round, for every 80 litres produced it will need 100 litres to be input.

100 for every 80 is the same as 100/80 = 1.25 times the output.
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