SOLUTION: bobs mom is 4 times older than him.How old is he if the product oof their ages are 400?

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Question 1198810: bobs mom is 4 times older than him.How old is he if the product oof their ages are 400?

Found 3 solutions by josgarithmetic, math_tutor2020, ikleyn:
Answer by josgarithmetic(39617)   (Show Source):
You can put this solution on YOUR website!
Bob, b
His mom, 5b
Product of their ages,

------------Is this some of what you are looking for ?

Answer by math_tutor2020(3817)   (Show Source):
You can put this solution on YOUR website!

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.

Answer by ikleyn(52781)   (Show Source):
You can put this solution on YOUR website!
.

Such form ". . . bobs mom is 4 times older than him" is NEVER USED in Math problems
in English, because it is AMBIGUOUS.

When it comes to the forum, it makes it clear that this current "math composer"
is unfamiliar with the traditional/standard way writing Math problems in English.
(never opened relevant Algebra textbook in English).