book Maths Puzzle Numerical Ability

there were 429 people at a play. admission was $1 for adults and $0.75 for children. the receits were $372.50. how many adults and how many children attended the play?

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book Other Question

The cost in dollars of manufacturing w wing nuts is given by the expression 0.07w + 13.3. Find the cost when 375 wing nuts are made. What is the average cost to manufacture one wing nut? choose the correct x + yi form for : 2(cos 120 degrees + i sin 120 degrees)