problem
Post on 01-Oct-2015
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I a certain family, the sum of the parents age is twice the sum of their childrens age now. Five years ago, the sum of the parents age was four times the sum of the childrens age during that time. In fifteen years, the sum of the parents age will be equal to the sum of their childrens ages. How many children are there in the family?X sum of parentsY sum of childrensN no. og childrenPresent:XY
Past:x-2(5)y-5n
Future:X+2(15)Y+15N
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