book Maths Puzzle Numerical Ability

You have $24.05 with 210 coins in quarters, nickles, and dimes, such that twice the number of quarters is 13 more than the number of nickels. Find how many of each coin you have.

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book Other Question

there were 429 people nat a play. admission was $1 for adults and $.75 for children. the receits were $372.50. How many adults and how many children attended the play? How many positive real zeros does the funtion f(x) = x4 + x3 - 7x - 1 have?