exam Maths Puzzle Numerical Ability

I have a worded question which has left me bambozelled. As I am unable to get the words into an equation. Any help would be greatly appreciated and is as follows.
On a calm day it

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exam Other Question

"Jimmy had $5.25 in nickels and quarters. If he had 15 more nickels than quarters, how many coins of each type did he have?" HELP ME PLEASE!!!! Please help me solve for "X":
a) 64^(x-2)=16^(1/3)
b) (x+3)(^2/3)=125(^2/9) ( I think it is 2)
c) logbasex 4=2 (I am thinking +&- 2 ???)