How old is Robert,if Marin is 9 years older than him and their ages make 21?

Answer 1

R + R + 9 = 21

2R = 12

R = 6

Answer 2

Thank you, but could you explain this solution for me , please?

Answer 3

R = Robert
R + 9 = Marin

Their two ages = 21.

The equation and its solution should be obvious.

Answer 4

Thank you very much.

Answer 5

You are very welcome.