Question

The difference between shelia and robbie's ages is 12. The sum of thier ages is 42. If shelia is the younger of the two. how old is robbie?

Answer 1

let

s = shelia's age
r = robbie's age

Answer 2

The difference between shelia and robbie's ages is 12

translates to

r - s = 12 (note: shelia is the younger of the two)

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The sum of their ages is 42.

translates to

r+s = 42

Answer 3

so you have this system

r - s = 12
r+s = 42


add up the equations to get


r - s = 12
r+s = 42
---------
2r+0s = 54

so, 2r = 54 ---> r = ???

once you find r, use it to find s

Answer 4

Thank you I am just

Answer 5

yw