Find the LCD, which is 20, so multiply 3/4 by 5 and get 15/20, multiply 3/5 by 4 and get 12/20, so 15-12= 3, so 3/20
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pi
9/20
No.
Eight and three fourths plus six and two fifths is fifteen and one twentieth.
three fifths plus one quarter = 17 twentieths