Question

Ionut a cules cirese . Prima data a mancat jumatate din vnumarul cireselor culese , apoi jumatate din cele ramase si inca 7 cirese si a vazut ca mai are 17 . Cate cirese a cules Ionut ?

Answer 1

x-cirese mancate prima data;

y-cirese mancate a doua oara;

t-cirese in total.

x=1/2*t

y=(t-x)/2+7;

x=1/2t;

y=(t-1/2t)/2+7=1/2t*1/2+7=1/4t+7;

t=1/4t+7+1/2t+17;

t=3/4t+24

t-3/4t=24

1/4t=24

t=24*4

t=96 cirese a cules Ionut;

Verificam:

x=1/2*96=48 cirese a cules prima data;

y=1/4*96+7=31 cirese a cules a doua oara;

48+31=79 cirese a mancat;

79+17=96 cirese in total;

Bafta!