Question
Download Solution PDFWhich two signs should be interchanged to make the given equation correct?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe pattern followed here is:
Find which two signs should be interchanged to make the given equation correct.
Let's check each option one by one.
Option 1) − and ×
Given: 81 × 9 + 15 ÷ 3 – 4 = 50
After interchanging the signs we get the;
⇒ 81 - 9 + 15 ÷ 3 × 4 = 50
⇒ 81 - 9 + 3 × 4 = 50
⇒ 81 - 9 + 12 = 50
⇒ 93 - 9 = 50
⇒ 84 ≠ 50
⇒ LHS ≠ RHS
Option 2) + and −
Given: 81 × 9 + 15 ÷ 3 – 4 = 50
After interchanging the signs we get the;
⇒ 81 × 9 - 15 ÷ 3 + 4 = 50
⇒ 81 × 9 - 5 + 4 = 50
⇒ 729 - 5 + 4 = 50
⇒ 733 - 5 = 50
⇒ 728 ≠ 50
⇒ LHS ≠ RHS
Option 3) ÷ and −
Given: 81 × 9 + 15 ÷ 3 – 4 = 50
After interchanging the signs we get the;
⇒ 81 × 9 + 15 - 3 ÷ 4 = 50
⇒ 81 × 9 + 15 - 0.75 = 50
⇒ 729 + 15 - 0.75 = 50
⇒ 744 - 0.75 = 50
⇒ 743.25 ≠ 50
⇒ LHS ≠ RHS
Option 4) ÷ and ×
Given: 81 × 9 + 15 ÷ 3 – 4 = 50
After interchanging the signs we get the;
⇒ 81 ÷ 9 + 15 × 3 – 4 = 50
⇒ 9 + 15 × 3 - 4 = 50
⇒ 9 + 45 - 4 = 50
⇒ 54 - 4 = 50
⇒ 50 = 50
⇒ LHS = RHS
Hence, the correct answer is "Option 4".
Last updated on Jul 19, 2025
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