Question

80% falha essa prova: 2+ 5 x 3+ 4-1

Answer 1

2 + 5 X 3 + 4 - 1 = 
2 + 15 + 4 - 1 = 
17 + 4 - 1 =
21 - 1 = 
= 20

Answer 2

2+ 5x 3+ 4-1
7 x 3 + 4 - 1
21 + 4 -1
25-1