Mother and daughter

The ratio of years mother and daughter is 5:2. After 7 years the ratio is 2: 1. How many years ago daughter was born?

Correct result:

d =  14


2m = 5d
1(m+7) = 2(d+7)

2•m = 5•d
1•(m+7) = 2•(d+7)

5d-2m = 0
2d-m = -7

d = 14
m = 35

Our linear equations calculator calculates it.

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