Question
Download Solution PDFWhich two signs should be interchanged to make the given equation correct?
7 * 9 + 3 ÷ 7 − 3 = 25
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFBODMAS Table:
Given Equation: 7 * 9 + 3 ÷ 7 − 3 = 25.
Now, interchanging the given symbols in the options.
1) ÷ and *
Given equation: 7 * 9 + 3 ÷ 7 − 3 = 25
After interchanging ‘÷ and *’, we get:
L.H.S = 7 ÷ 9 + 3 * 7 − 3
= 0.78 + 3 * 7 - 3
= 0.78 + 21 - 3
= 21.78 - 3
= 18.78 ≠ R.H.S
2) ÷ and +
Given equation: 7 * 9 + 3 ÷ 7 − 3 = 25
After interchanging ‘÷ and +’, we get:
L.H.S = 7 * 9 ÷ 3 + 7 − 3
= 7 * 3 + 7 − 3
= 21 + 7 - 3
= 28 - 3
= 25 = R.H.S
3) + and *
Given equation: 7 * 9 + 3 ÷ 7 − 3 = 25
After interchanging ‘+ and *’, we get:
L.H.S = 7 + 9 * 3 ÷ 7 − 3 = 25
= 7 + 3.857 - 3
= 10.857 - 3
= 7.857 ≠ R.H.S
4) + and −
Given equation: 7 * 9 + 3 ÷ 7 − 3 = 25
After interchanging ‘+ and -’, we get:
L.H.S = 7 * 9 - 3 ÷ 7 + 3
= 7 * 9 - 0.42 + 3
= 63 - 0.42 + 3
= 66 - 0.42
= 65.58 ≠ R.H.S
Hence, the correct answer is "Option 2".
Last updated on Jun 25, 2025
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