Susie is 4 years old and Cindy is 2 years
old. Their father, Terry, is 30 years old.
How long will it be before the sum of the
children's ages is half of his?

Susie is 9 and Cindy is 7, Terry would be 32

The sum of their ages would be 16, which is half of 32

Step-by-step explanation:

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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