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The age of Derrick is 1/3 to his father's age and 1/5 of his grandfather's.if the sum of there ages is 144,how old is Derrick
He is 16 yrs. old... Can't explain how I got it sorry... I'm bad in English. But my answer is correct! Trust me! Derrick is 16 yrs. old. His father is 48 yrs. old his grandfather is 80 yrs. old. To check if my answer is correct... add 16, 48 and 80 :D
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