Question

(20 16/25+13 9/25)-(23 4/14+7 13/14).

Answer 1

(80.64+5.56)-(16.714+50.928)≈86.2-66.842≈19.358

Answer 2

20 16/25+13 9/25=34;
23 4/14+7 13/14=30 17/14=30+1 3/4=31 3/4;
33 4/4-31 3/4=2 1/4.