Question
Download Solution PDFWhich two signs should be interchanged to make the given equation correct?
81 + 3 ÷ 9 * 5 − 12 = 60
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
81 + 3 ÷ 9 * 5 − 12 = 60
Calculation:
By option Method:
Option 1: exchange ÷ and +
⇒ 81 ÷ 3 + 9 * 5 − 12 = 60
⇒ 27 + 45 -12 = 60
⇒ 60 = 60
This is correct the equation.
Option 2: exchange + and *
⇒ 81 * 3 ÷ 9 + 5 − 12 = 60
⇒ 27 +5 - 12 = 60
⇒ 20 ≠ 60
This is not correct the equation.
Option 3: exchange ÷ and –
⇒ 81 + 3 - 9 * 5 ÷ 12 = 60
⇒ 81 + 3 - 3.75 = 60
⇒ 80.25 ≠ 60
This is not correct the equation.
Option 4: exchange + and –
⇒ 81 - 3 ÷ 9 * 5 + 12 = 60
⇒ 81 - 1.66 + 12 = 60
⇒ 91.34 ≠ 60
This is not correct the equation.
∴ Interchanges (÷ and +) would make the given equation correct.
Last updated on Jul 22, 2025
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