Question

20-18,6:(6$frac{11}{15}$ - 4$frac{3}{20}$)

Answer 1

20 - 18,6 : (6 11/15 - 4 3/20) = 12,8

1) 6 11/15 - 4 3/20 = 6 44/60 - 4 9/60 = 2 35/60 = 2 7/12
2) 18,6 : 2 7/12 = 186/10 : 31/12 = 186/10 * 12/31 = (6*6)/(5*1) = 36/5 = 7 1/5
3) 20 - 7 1/5 = 19 5/5 - 7 1/5 = 12 4/5 = 12,8