Question

Dad is 4 times as old as his son Jim. In 10 years, Dad's age will be 20 years more than twice Jim's age. How old is Jim?

If D = dad's age now and J = Jim's age now, which of the following systems could be used to solve the problem?

Answer 1

Dad is 4 times as old as Jim, therefore dad's age can be represented by 4J.

Dad's age will be 20 years more than twice Jim's age.

We can write:

D + 10 = 2(J + 10) + 20

So our equations are:

D = 4J
D + 10 = 2(J + 10) + 20

Answer 2

@donald98

Answer 3

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