1)(x-11)×55=660
55x-605=660
55x=660-605
55x=1265
x=1265/55
x=23
2)(x-10)×72=1368
72x-720=1368
72x=1368+720
72x=2088
x=2088/72
x=29
1)(x-11)×55=660
55x-605=660
55x=660-605
55x=1265
x=1265/55
x=23
2)(x-10)×72=1368
72x-720=1368
72x=1368+720
72x=2088
x=2088/72
x=29