Too simple!

Algebra Level 3

If my sister's age is half of my age .If my age will be 40 years after 10 years , Then what will be my sister's age 12 years ago?


The answer is 3.

Shubham Joshi by Shubham Joshi , 20, India

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1 solution

M = your present age

S = your sisters present age

Your age 10 years from now is 40, so

M + 10 = 40 M+10=40 ⟹ \implies M = 30 M=30

So your sisters age is 30 2 = 15 \dfrac{30}{2}=15 .

And her age 12 years ago was 15 − 12 = 3 15-12=\boxed{3}

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