exam Maths Puzzle Numerical Ability

4x-7y=14 20x-35y=-15 subitution method

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Suppose that lateral faces VAB, VBC, and VCA of triangular pyramid VABC all have the same height drawn from V. Let F be the point in base ABC that ins closest to V, so that VF is t Adult tickets for a play cost $17 and child tickets cost $10. If there were 33 people at a performance and the theater collected $421 from thicket sales, how many children attended the play?