7 out of 8 - (1 out of 6 + 3 out of 10) = how many
=105 of 120-20 of 120-36 of 120
=49 out of 120
8 = 7 and 7 parts = 6 and 10 parts = 6 and 10 parts = 10 parts?
8 = 7 / 7 / 7 = 6 / 10 / 20 = 6 / 5 / 10 = 1 / 8