tolong bantu secepat nya

1. 180 - 75 = 105
2. 90 - 65 = 25
3. 3x + 2x = 180
5x = 180
x = 180 : 5
x = 36
a) 36
b) 3×36 = 108
c) 2×36 = 72

maaf jika salah