Which two numbers and two signs should be interchanged in the following equation to make it correct?
4 + 2 ÷ 7 + 8 × 9 = 25
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 4 and 9, ÷ and ×.
Given equation : 4 + 2 ÷ 7 + 8 × 9 = 25
From option 3: 4 and 9, ÷ and ×
Now, by interchanging the signs and numbers:
⇒ 9 + 2 × 7 + 8 ÷ 4 = 25
Using the BODMAS rule,
⇒ 9 + 2 × 7 + (8 ÷ 4) = 25
⇒ 9 + (2 × 7) + 2 = 25
⇒ 9 + 14 + 2 = 25
⇒ 25 = 25
Hence, the correct answer is 4 and 9, ÷ and ×.