(3/5-1/20)*(2/3+4/5+8/15)

(3/5-1/20)*(2/3+4/5+8/15)

Simplify the terms in the first set of parentheses

3/5 - 1/20  =   12/20 -  1  /20   = 11/20

Simplify the terms in the second set of parentheses

2/3 + 4/5 + 8/15 =   10/15 + 12/15 + 8/15  =  (30/15) = 2

So

(11/20) * (2)  =

22/20  =

11/10