Question 738188
If a boy is 5 years old, and his sister is 3 times his age. How old will the sister be when the boy is 12 years old ?



If the boy is 5 years old then the sister's age is:

5 * 3 = 15 years old

Therefore:

12 - 5 = 7

When the boy will be 12 years old the sister will be:

15 + 7 = 22 years old



Answer:

22 years old





Lennox Obuong
Algebra Tutor
Nairobi, Kenya