Hello,
let's assume j the john's age, m the mary's age.
<span>"John is twice as old as mary"==>j=2*m
</span>
<span>"the sum of their ages is 21" ==>j+m=21
==>2*m+m=21
==>3m=21
==>m=7
and j=21-7=14
</span>
Answer:gtghjkmjnhbvfcdvf
Step-by-step explanation:12 cvgjbvbn
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a mathematical function showing the number of instances in which a variable takes each of its possible values.
2 is the smallest number out of the 5
As shown in the model below, there are three lines.
