SOLUTION: 5. A boy is 5 years old and his sister is three times as old as he is. When the boy is 15 years old, how old will his sister be?

Question 1118411: 5. A boy is 5 years old and his sister is three times as old as he is. When the boy is 15 years old, how old will his sister be?

Found 2 solutions by josgarithmetic, t0hierry:
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
b, boy now
x, sister now

Boy is 5
and
Sister is 15
NOW.

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When the boy is 15 years old, how old will his sister be?
------------------------------------------------

When will that be? Ten more years.

You can answer the question for the exercise.
In ten more years, the sister will be ____________.
Answer by t0hierry(194) (Show Source): You can put this solution on YOUR website!
Short answer
b = 5
s = 15
b = 5+10
s = 15 + 10 = 25

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