If 10 years ago, their ages summed to 70, then today, their ages sum to 70 + 2(10) = 90

Therefore, let the daughter's age be D

Then mother's is 90 - D

We then get: 90 - D = 2D

90 = 3D

D, or daughter is 

In 10 years' time, daughter will be: 



OR



If their ages summed to 70, 10 years ago, then in ten years' time, their ages will sum to 70 + 2(20), = 110 years

Let daughter's age, 10 years from now, be D

Then mother's then, would be 110 - D

We then see that today, daughter will be D - 10, and mother will be 110 - D - 10, or 100 - D

We then get: 100 - D = 2(D - 10)

100 - D = 2D - 20

- D - 2D = - 20 - 100

- 3D = - 120

D, or daughter, in 10 years, will be:  

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