exam Maths Puzzle Numerical Ability

Vicky is now 4 times as old as Cristy. five years ago,the sum of their ages was 45. how old are they now

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exam Other Question

since i didnt understand the multiplying part, i didnt really understand the division part either, would be cool if someone could also explain this problem to me; x^2+5x+4/(x+3)^2 divided by x+1/x^2-9. Sally has twice as many times as nickels. The total value is $3.50. How many nickels does she have?