Question

Suma a trei nr a b c este 345 calculati paranteza mica (a +b)-(a+c)daca a+b=3rest 15 b:c=2 rest 15

Answer 1

a+b+c=345
a:b=3 r 15...=> a=b*3+15...=> a=3b+15
b:c=2 r 15...=> b=2*c+15...=> b=2c+15....=> a=(2c+15)*3+15...=>a=6c+45+15
(a+b)-(a+c)=?

6c+60+2c+15+c=345
9c+75=345
9c=345-75
9c=270
c=370:9
c=30
a=30*6+60
a=180+60
a=240
b=30*2+15
b=60+15
b=75

240+75+30=345
(240+75)-(240+30)=
=315-270
=45.......................=>(a+b)-(a+c)=45