Question 145857
Assume Mary's age to be x
Which would mean Ann's age = 6 + x
Now, Ann was Mary's age 6 yrs ago which means : x-6
And now her age is twice the age of Mary 6 yrs ago : 2(x-6)

NOw, equating both the equations we get : 
2(x-6) = 6 + x
2x-12 = 6 + x
2x - x = 6 + 12
x = 18

Hence, Mary's age is 18 yrs while Ann is 24 yrs old.

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