Question
Download Solution PDFWhich two numbers (not individual digits) should be interchanged to make the given equation correct?
21 × 5 – 35 + (42 ÷ 7) + 28 = 96
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven : 21 × 5 – 35 + (42 ÷ 7) + 28 = 96
According to the question, after replacing the numbers :
Option 1) 28 and 35
21 × 5 – 35 + (42 ÷ 7) + 28 = 96
⇒ 21 × 5 – 28 + (42 ÷ 7) + 35 = 96
⇒ 21 × 5 – 28 + (42 ÷ 7) + 35 = 96
⇒ 21 × 5 – 28 + 6 + 35 = 96
⇒ 105 + 6 + 35 – 28 = 96
⇒ 146 - 28 = 96
⇒ 118 ≠ 96 (LHS ≠ RHS)
Option 2) 35 and 42
21 × 5 – 35 + (42 ÷ 7) + 28 = 96
⇒ 21 × 5 – 42 + (35 ÷ 7) + 28 = 96
⇒ 21 × 5 – 42 + (35 ÷ 7) + 28 = 96
⇒ 21 × 5 – 42 + 5 + 28 = 96
⇒ 105 + 5 + 28 – 42 = 96
⇒ 138 - 42 = 96
⇒ 96 = 96 (LHS = RHS)
Option 3) 21 and 42
21 × 5 – 35 + (42 ÷ 7) + 28 = 96
⇒ 42 × 5 – 35 + (21 ÷ 7) + 28 = 96
⇒ 42 × 5 – 35 + (21 ÷ 7) + 28 = 96
⇒ 42 × 5 – 35 + 3 + 28 = 96
⇒ 210 + 3 + 28 – 35 = 96
⇒ 241 – 35 = 96
⇒ 206 ≠ 96 (LHS ≠ RHS)
Option 4) 28 and 21
21 × 5 – 35 + (42 ÷ 7) + 28 = 96
⇒ 28 × 5 – 35 + (42 ÷ 7) + 21 = 96
⇒ 28 × 5 – 35 + (42 ÷ 7) + 21 = 96
⇒ 28 × 5 – 35 + 6 + 21 = 96
⇒ 140 + 6 + 21 – 35 = 96
⇒ 167 – 35 = 96
⇒ 132 ≠ 96 (LHS ≠ RHS)
Hence, "Option 2" is the correct answer.
Last updated on Jun 3, 2025
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