Question
Download Solution PDFWhich two signs should be interchanged to make the below equation mathematically correct?
20 + 34 - 81 × 9 ÷ 2 = 36
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDF1. ÷ and -
20 + 34 ÷ 81 × 9 - 2 = 36
⇒ 20 + 0.41 × 9 - 2 = 36
⇒ 20 + 3.69 - 2 = 36
⇒ 23.69 - 2 = 36
⇒ 21.69 ≠ 36
2. + and -
20 - 34 + 81 × 9 ÷ 2 = 36
⇒ 20 - 34 + 81 × 4.5 = 36
⇒ 20 - 34 + 364.5 = 36
⇒ 384.5 - 34 = 36
3. × and ÷
20 + 34 - 81 ÷ 9 × 2 = 36
⇒ 20 + 34 - 9 × 2 = 36
⇒ 20 + 34 - 18 = 36
⇒ 54 - 18 = 36
⇒ 36 = 36
4. + and ×
20 × 34 - 81 + 9 ÷ 2 = 36
⇒ 680 - 81 + 4.5 = 36
⇒ 684.5 - 81 = 36
⇒ 603.5 ≠ 36
Hence, '× and ÷' is the correct answer.
Last updated on Jul 8, 2025
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