Which two numbers (not individual digits) should be interchanged to make the given equation correct?

21 × 5 – 35 + (42 ÷ 7) + 28 = 96 

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SSC Selection Post 2024 (Matriculation Level) Official Paper (Held On: 26 Jun, 2024 Shift 1)
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  1. 28 and 35
  2. 35 and 42
  3. 21 and 42
  4. 28 and 21

Answer (Detailed Solution Below)

Option 2 : 35 and 42
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Detailed Solution

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BODMAS

Given : 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.

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