1) (720-t*6):9=60
720-t*6 = 540;
t*6 = 720 - 540 = 180;
t = 30;
2) 4*(250:а+12)=68
250:a + 12 = 17;
250:a = 5;
a = 250:5 = 50;
1) (720-t*6):9=60
720-t*6 = 540;
t*6 = 720 - 540 = 180;
t = 30;
2) 4*(250:а+12)=68
250:a + 12 = 17;
250:a = 5;
a = 250:5 = 50;