45th birthday

This year Mrs. Clever celebrated her 45th birthday. Her three children are now 7, 11, and 15 years old. How many years will Mrs. Clever's age equal the sum of her children's years?

Correct answer:

x =  6

Step-by-step explanation:

45+x = (7+x)+(11+x)+(15+x)

2x = 12

x = 12/2 = 6

x = 6

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