Question

Which two sign or numbers need to be interchanged to make the following equation correct?

(18 ÷ 9) + 9 × 8 = 24

1. +, ÷ 
2. +, × 
3. 18, 8
4. ×, ÷ 

Answer 1

Correct Answer - Option 1 : +, ÷ 

1) +, ÷ 

Given equation: (18 ÷ 9) + 9 × 8 = 24

After interchanging signs, we get:

(18 + 9) ÷ 9 × 8 = 24

=> 27 ÷ 9 × 8 = 24

=> 3 × 8 = 24

=> 24 = 24

2) +, × 

Given equation: (18 ÷ 9) + 9 × 8 = 24

After interchanging signs, we get:

(18 ÷ 9) × 9 + 8 = 24

=> 2 × 9 + 8 = 24

=> 18 + 8 = 24

=> 26 ≠ 24

3) 18, 8

Given equation: (18 ÷ 9) + 9 × 8 = 24

After interchanging numbers, we get:

(8 ÷ 9) + 9 × 18 = 24

=> 0.89 + 162 = 24

=> 162.89 ≠ 24

4) ×, ÷ 

Given equation: (18 ÷ 9) + 9 × 8 = 24

After interchanging signs, we get:

(18 × 9) + 9 ÷ 8 = 24

=> 162 + 1.125 = 24

=> 163.125 ≠ 24

Hence, ‘+, ÷ ’ is the correct answer.