Explanation:

Let the present ages of mother and daughter be x and y

So, according to the question ( ??−10 ) / (??−10 ) =  3   /  1

??=3??−30+10

??=3??−20

Also  ( ??+10) (?? +10} = 137

7??+70=13??+130

Putting the value of x in the above equation, we get 7(3??−20)+70=13??+130

8??=200  ,  ??=25
Therefore x = 3*25 – 20 = 55