Question 1118411
b, boy now
x, sister now

{{{system(b=5,x=3*5=15)}}}


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?
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When will that be?  Ten more years.


You can answer the question for the exercise.
In ten more years, the sister will be ____________.