Question

15/20 ÷ 21/32 + 9/7 × 1/4 - 65/45 ÷ 78/54=

Answer 1

15/20 ÷ 21/32 => 3/4 x 32/21 => 8/7

9/7 x 1/4 => 9/28

65/45 ÷ 78/54 => 13/9 x 9/13 => 1

8/7 + 9/28 -1 => (32 + 9 - 28)/28

=> 13/28