x years ago the sum of ages of two friends was y years then what will be the sum of their ages after z years.
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Answer:
3x+y
Step-by-step explanation:
Let their present age be a,b,c
Sum of their present age =a+b+c
Their ages x years ago a−x,b−x,c−x
Sum =a+b+c−3x
Given a+b+c−3x=y
a+b+c=y+3x=3x+y
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