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SSC MTS 2020 · PYQ · Mathematical Operations · medium

Which two signs should be interchanged to make the given equation correct? 18 ÷ 9 + 12 × 4 − 8 = 15

Answer

The correct answer is D: − and +. Swapping − and ÷: 18 − 9 + 12 × 4 ÷ 8 = 18 − 9 + 12 × (4/8) = 18 − 9 + 12 × 0.5 = 18 − 9 + 6 = 15. This confirms that interchanging − and ÷ gives the correct…

  1. A.÷ and ×
  2. B.+ and −
  3. C.× and −
  4. D.− and +✓ Correct

Explanation

Swapping − and ÷: 18 − 9 + 12 × 4 ÷ 8 = 18 − 9 + 12 × (4/8) = 18 − 9 + 12 × 0.5 = 18 − 9 + 6 = 15. This confirms that interchanging − and ÷ gives the correct result.
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