book Maths Puzzle Numerical Ability

Joan Madden decided to pay 1/5 of the camp tuition for her grandson. Joan saved her daughter-in-law $250. What was the total cost of the tuition?

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please help solve this
3x=wyz

solve for x, w, and y
please explain so i can try to do others without help, thank you very much
please reduce the fraction w2 + 5w + 6 / w2 - w - 12 thank you!!

A. w-2/w-4
B. w+2/w-4
C. w+2/w+4
D. w-2/w+4