Respuesta :

christinann062
21 divided by 3 = 7

That means the brother is 14 years younger.

36 - 14 = 22

The brother will be 22 years old.
apologiabiology
a third of 21=21/3=7

in how many years
36-21=15

in 15 years
7+15=22

age is 22

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