Asked by Jade

How old is Robert,if Marin is 9 years older than him and their ages make 21?
Answered by Ms. Sue
R + R + 9 = 21

2R = 12

R = 6

Answered by Jade
Thank you, but could you explain this solution for me , please?
Answered by Ms. Sue
R = Robert
R + 9 = Marin

Their two ages = 21.

The equation and its solution should be obvious.

Answered by Jade
Thank you very much.
Answered by Ms. Sue
You are very welcome.
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