Question

a+b+c+d=779 a-b=99 d:c=3 b=c:2 c=?? dau coroana la primul care imi zice raspunsul

Answer 1

Răspuns:

$a+b+c+d=779 \\\\a-b=99= > a=b+99 \\\\d:c=3= > d=3c= > d=6b\\ \\b=c:2= > c=2b\\\\b+99+b+2b+6b=779\\\\10b=779-99\\\\b=680:10= > b=68\\\\c=2*68= > c=136$