Mathematics, 25.12.2019 10:31, nancyo

John is twice as old as mary. the sum of their ages is 21. how old is mary?

let j = john's age and m = mary's age. select the system equations that represents the problem.

a. j - 2m = 0
b. m - 2j = 0
c. j + m = 21
d. j = m + 2

Answers: 2

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John is twice as old as mary. the sum of their ages is 21. how old is mary?

let j = jo...