book Maths Puzzle Numerical Ability

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?

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book Other Question

I need help solving x4 -5x2 - 36=0 I am not sure what to do with x4 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.