解
Marge is twice as old as Consuelo. The sum of their ages seven years ago was 13. How old are they now?
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Translate the problem into an equation:
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人気の例
The sum of the ages of John and Mary is 32. Four years ago, John was twice as old as Mary.The sum of the ages of a father and son is 56. Four years ago, the father was 3 times as old as the son.The sum of Jill and Aaron's age is 60. In three years, Jill will be twice as old Aaron . How old is Jill now?James is 7 years older than Laurel. James will be 2 times as old as Laurel next year. How old is Laurel?A pitcher is 30 years old, and a vase is 22 years old. How many years ago was the pitcher twice as old as the vase?