12, regardless of what 8 times 5 happens to be. There's no connection.
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(4/5)*(-3/8) = [4*(-3)]/(5*8) = -12/40 = -3/10
10/3 x 4/5 = 40/15 = 8/3 or 2 and 2/3
29/5 x 7 = 203/5 = 40 and 3/5
3/8 x 4/5 = (3 x 4)/(8 x 5) = 12/40 = 6/20 = 3/10
40