The sum 28

The sum of the age of a girl and her mother is 38. Next year the mother will be four times as old as her daughter. How old was the mother when her daughter was born?

Correct answer:

m =  31
d =  7

Step-by-step explanation:

m+d=38 m+1=4 (d+1)  d+m=38 4dm=3  Pivot:Row1Row2 4dm=3 d+m=38  Row241 Row1Row2 4dm=3 1.25m=38.75  m=1.2538.75=31 d=43+m=43+31=7  d=7 m=31

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