Im currently doing GCSE maths and the current topic is ratios. Im comfortable sharing a value between ratios but im confused by questions like
Increase £30 in the ratio of 5:2
My materials arent very clear and its frustrating me, could someone please explain the method for calculating this type of answer?
I think what they are thinking is:
(new number of pounds):(old number of pounds)::5:2
Or in words: the ratio of the result to the starting value should be the same as 5 to 2.
So if our result is X, we have $$\frac X{30} = \frac52$$
Multiply both sides by 30 to find X.