Q: If the mother's age 10 years ago was 3 times the age of her son, and in 10 years the mother's age will be twice the age of her son, what is the ratio of their present ages?
C
Answer:
C
Explanation:
If the age of the mother 10 years ago was 3 times the age of her son,
and the mother's age in 10 years will be twice the age of her son,
the equation can be represented as:
3x+10+10=2(x+10+10)
3x+20=2x+40
x=20
The present ratio of the mother's age to the son's age is
(3x+10):(x+10) = (3*20+10):(20+10) = 70:30 = 7:3.
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