Question

Maria , Andrei si Ciprian au adunat impreunu 91 de castane . Andrei a adunat cat jumatate din numarul castanelor adunate de Maria , iar Ciprian cat
jumatate din numarul castanelor adunate de Andrei . Cate castane au adunat fiecare copiil ?

Answer 1

maria are 4 segmente
andrei are 2 segmente
ciprian are 1 segment si se rezolva asa
 91:7=13
13x2=26
26x2=52
13+26+52=91(castane)

Answer 2

Total 91 castane.
Maria=a
Andrei=b
Ciprian=c
a+b+c=91
b=$\frac{a}{2}$
c=$\frac{b}{2}$=$\frac{a}{4}$
a+$\frac{a}{2y}$+$\frac{a}{4}$=91 Aducem la acelasi numitor!(4)
$\frac{4a+2a+a}{4} = \frac{364}{4} /*4$
7a=364==>a=52
b=$\frac{a}{2} = \frac{52}{2} =26$
c=$\frac{a}{4} = \frac{52}{4} =13$