Question

mihaela alexandra si costin au strans impreuna o suma de bani. mihaela si alexandra au impreuna suma de 324 de lei, alexandra si costin au impreuna suma de 362 de lei , iar mihaela si costin au impreuna sma de 312 lei. ce suma a pus fiecare

Answer 1

M+A+C=X
M+A=324
A+C=362
M+C=312
2M+2A+2C=324+362+312=998
A+M+C=998/2=499
A=499-312=187
M=499-362=137
C=499-324=175

Answer 2

M+A=324
C+A=362
M+C=312
R: M+C+12=M+A (312+12=324)=> C+12=A
 Inlocuiesti in relatia a 2 si => 2A+12=362 ,  2A=350, A=175
C=A-12
C=175-12
C=163
M=312-C => M=312-163 => M=149