exam Maths Puzzle Numerical Ability

Florence Flask has 500 grams of a 72% salt solution. How much water must she add to obtain a 25 % salt solution?

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exam Other Question

twice the difference of a number and 3 is equal to three times the sum of the number and 5 write in simplest form

5r^3st^2
over
-10r^6s^3t

A)-t
over
2r^3s^2
B)-t^2
over
2r^2s^3
C)-r^2s^3t^2
over
2
D)-2r^3s^2t