Question

daca c ori(3+d)=140 si c ori d =125,calculeaza pe c.

Answer 1

c*(3+d)=140
c*d=125

c*(3+d)=140
c*3+c*d=140
140-125=15(c*3)
c=15:3=5

sper ca te-am ajutat si ca ai inteles !!

Answer 2

cx(3+d)=140
cxd=125
cx(3+d)=140(dam factor comun pe "c")
cx3+cxd=140
=>140-125=15(cx3)
=>15c=3c
=>c=15:3
=>c=5