exam Maths Puzzle Numerical Ability

a vending machine takes only nickels and dimes.there are 5 times as many dimes as nickels in the machine.the face value of the coins is $4.40.how many of each coin are in the machine?

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exam Other Question

What is the domain of the function F given by F(x)=x+4/x ?
I think the answer is "all reall numbers except 0"

Given f(x)=4-x-x^2 find f(3)

I think th answer is f(3)=-8

thank you! Find four consecutive whole numbes such that the sum of the first three numbers equal the fourth number