Question

Alina , Radu si Mihai au cules impreuna 188 de castane . Radu a cules de doua ori mai multe decat Alina si cu 13 mai putine castane decat Mihai .
Cate castane a cules fiecare copil ?

Answer 1

a-Alina
r-Radu
m-Mihai
a+r+m=188
r=2a
m=r+13
a+2a+r+13=188
a+2a+2a+13=188
5a+13=188
5a=188-13
5a=175
a=35
r=2a
r=70
m=r+13
m=70+13
m=83

Answer 2

PAI: 188X2-13
=376-13
=363
=363:188
=1 REST 175