exam Maths Puzzle Numerical Ability

a vending machine takes only dimes and quarters. so far the machine has only taken a total of 30 coins. the amount of money it has collected is $4.20.

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exam Other Question

factoring a quadratic with leading coefficient greater than one
2y^2+15y+28
The number of men at a party is 2/9 of the number of women. There are 91 more women than men. How many people are there in the party.