a father's age is equal to total age of three children .After 5 year the father will be only 6/7 of the total age how old is the father now?
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Step-by-step explanation:
let's father age is equals to A years and and age of three children's be X Y and Z years
according to question
A=X + Y + Z
after 5 year age of father be A + 5 and and sons age become X + 5, Y + 5 and Z + 5
according to questions A+ 5=6/7( X + 5+ Y + 5 + Z + 5 )
A+5=6/7(X+Y+Z+15)
7A+35=6X+6Y+6Z+90
7A=6X+6Y+6Z+90-35
7A=6X+6Y+6Z+55
A=6X+6Y+6Z+55/7
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