30-23,1:(5 7/20-4 6/35)

Question

30-23,1:(5 7/20-4 6/35)

Answer 1

5 7/20-4 6/35=5 49/140-4 24/140=1 25/140=1 5/28
23,1:1 5/28=231/10*28/33=19,6
30-19,6=10,4