Răspuns :
90+x+24+x+191+x=680
3x+305=680
3x=375
x=125
90+125=215
24+125=149
191+125=316
3x+305=680
3x=375
x=125
90+125=215
24+125=149
191+125=316
90+x+24+x+191+x=680
3x+305=680
3x=375
x=125
90+125=215
24+125=149
191+125=316
3x+305=680
3x=375
x=125
90+125=215
24+125=149
191+125=316