Ali had $50 & Abu had $110. Each yr, Will gave Ali and Abu an equal amount of money each. After 4 years, Ali had half the amount of money Abu had. How much money did Will gave them in allr?

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If x is the amount Will gave them each year, then after 4 years Ali will have 50+4x and Abu 110+4x.

Abu=2×Ali, so 110+4x=2(50+4x), 110+4x=100+8x, 10=4x, x=$2.50.

In all Will gives them 8x=$20.

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