tolong bantu ya pakai cara 1,2,3 trimakasih

1. 180 -125 = 55
180 - 55 - 50 = 75 (C)
2. 1.25 x 5 = 6.25
0.75 x 5 = 3.75
6.25 + 3.75 = 10 (B)
3. 60 = 3y
20 = y
180 - 60 = 120
120 = 4x
30 = x
30+20 = 50 (D)
SEMOGA BERMANFAAT