Question 4628
You need to convert the English into maths. That is the main challenge:


{{{(16+x)/(37+x) = 5/8}}} and now cross-multiply, to give

{{{8(16+x) = 5(37+x)}}}
128+8x = 185+5x
3x=57
x=57/3
--> x=19


CHECK!!! --> 16+19 is 35 and 37+19 is 56, so the fraction is then 35/56 which simplifies to 5/8, so correct.


Now you try the subtract version yourself.


jon