John is twice as old as mary. the sum of their ages is 21. how old is mary?
let j = jo...
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
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