3 3/4 x 1 1/5 + (2.55 + 2.7 ): (0.1 - 1/80)

Question

3 3/4 x 1 1/5 + (2.55 + 2.7 ): (0.1 - 1/80)

Answer 1

1)2, 55+2, 7=5, 25
2)0, 1-1/80=7/80
3)3 3/4×1 1/5 =15/4×6/5=9/2=4 1/2
4)5, 25:7/80=5 1/4:7/80=21/4:80/7=60
5)60+4 1/2=64 1/2