exam Maths Puzzle Numerical Ability

Adult tickets for a play cost $11 and child tickets cost $10. If there were 23 people at a performance and the theater collected $246 from ticket sales, how many children attended the play?

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exam Other Question

the volume(v) of a sphere varies directly as the cube of its radius(r). if the volume of a sphere of 6 cm in radius is 904,8 cm3, find the volume of a sphere with a radius is 7 cm. Jennifer has collected $4.50 in nickels and dimes. If she has 55 coins, how many of each kind of coin does she have?

im confused i just cannot do word problems