Question

Maria, Andrei si Ciprian au audant impreuna 91 de castane.Andrei a adunat cat jumatate din numarul castanelor adunate de Maria, iar Ciprian cat jumatate din numarul castanelor adunat de Andrei.Cate costane a adunat fiecare copil?

Answer 1

m+a+c=91
a=m/2
c=a/2=(m/2)/2=m/4
m+m/2+m/4=91
(4m+2m+m)/4=91
7m=364
m=52(castane Maria)
a=52/2=26(castane Andrei)
c=26/2=13(castane Ciprian)