Answer for question (vi) emergency
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Let the age of son=x yrs
Age of jacob=y yrs
Case1
y+5=3(x+5)
y=3x+15-5
y=3x+10
Case 2
(x-5)7=y-5
7x-35=3x+10-5
7x-3x=40
4x=40
x=4
y=3×4+10
y=22
Age of jacob=22 yrs
Age of son=4 yrs
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