Question 1198810
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b = bob's age
4b = his mom's age


b*4b = product of their ages = 4b^2
4b^2 = 400
b^2 = 400/4
b^2 = 100
b = sqrt(100)
b = 10
Bob is 10 years old and his mother is 40


Check:
10*40 = 400
The answers are confirmed.
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