exam Maths Puzzle Numerical Ability

hey

ok. the bases of a trapezoid are 3ft and 4ft. the area is 42 sq ft. i need help finding the height.

thanks

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exam Other Question
How many gallons of a 42% solution must be mixed with 73 gallons of 12% solution to obtain a 20% solution?

73 + y = t
( 12% of 73) + ( 42% of y ) = 20% of t

73 + y = t Please help with this problem

Sean's turtle moves along at y cm/s. Ernie's turtle can only move at one third of that pace. How far apart ate the turtles after t seconds if they