exam Maths Puzzle Numerical Ability

Joe has a collection of nickels and dimes that is worth $6.00. If the number of dimes were doubled and the number of nickels were increased by 6, the value of the coins would be $9.90. How many dimes does he have?

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exam Other Question

Three boys are going to a party and comparing how much money they have. sam works out that he has $6 more than Mark and $12 more than Dean. If they have $75 altogether, how much does Sam have? hi i really dont understand what to do for this equation please help me out. thanks i apreciate it.

(16x) over (25x^2-5) times ( 2x^2-x-1) over(8x)