exam Maths Puzzle Numerical Ability

do you know what the answer to this problem is ? The coin box of a vending machine contains 6 times as many quarters as dimes. If the total amount of money in quarters and dimes is $28.80, how many quarters and how many dimes are in the box?

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exam Other Question

f(x) = 3x-5 / x+2 f ^ -1 (x) =

a) 2x+5 / x-3

b) -2x-5 / x-3

c) -2x-5 / x+5

d) 2x+3 / x-5

e) None of these kelly telephoned brook about a homework problem. Kelly said Four plus three times two is 14,isnt it? brook replied, No its 10. did someone make a mistake?can you explain where these two answer came from?