Mathematics, 21.09.2019 16:30 annjetero2oy23ay
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.
j - 2m = 0
m - 2j = 0
j + m = 21
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 = john's age and...
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