Question

Daca adunam triplul unui numar cu treimea sa, obtinem 100. Cat este numarul?
Multumesc

Answer 1

3a+a/3=100
9a/3+a/3=300/3
9a+a=300
10a=300
a=30

Answer 2

3a+a/3=100
⇒9a/3+a/3=100
⇒10a/3=100
⇒10a=3·100
⇒10a=300
⇒a=30;