Q1. Which two signs should be interchanged in the following equation to make it correct? 20 + 5 ÷ 20 × 8 - 20 = 38
A + and ×
B - and + Correct
C ÷ and ×
D - and ÷
Explanation
Interchanging the minus sign and the plus sign changes the expression to 20 - 5 ÷ 20 × 8 + 20. By the usual order of operations, division and multiplication are handled first from left to right: 5 ÷ 20 × 8 = 2. The expression then becomes 20 - 2 + 20 = 38, which is correct. Interchanging plus with multiplication, division with multiplication, or minus with division does not produce the required value 38.