Question
Download Solution PDFWhich two signs should be interchanged to make the given equation correct?
10 ÷ 63 × 7 + 90 − 80 = 100
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFLet's check each option,
1) − and ÷
→ 10 - 63 × 7 + 90 ÷ 80 = 100
→ 10 - 63 × 7 + 9/8 = 100
→ 10 - 441 + 9/8 = 100
→ 89/8 - 441 ≠ 100
→ LHS ≠ RHS
2) × and −
→ 10 ÷ 63 - 7 + 90 × 80 = 100
→ 10/63 - 7 + 90 × 80 = 100
→ 10/63 - 7 + 7200 ≠ 100
→ LHS ≠ RHS
3) + and −
→ 10 ÷ 63 × 7 - 90 + 80 = 100
→ 10/63 × 7 - 90 + 80 = 100
→ 10/9 - 90 + 80 = 100
→ 730/9 - 90 ≠ 100
→ LHS ≠ RHS
4) × and ÷
→ 10 × 63 ÷ 7 + 90 − 80 = 100
→ 10 × 9 + 90 − 80 = 100
→ 90 + 90 − 80 = 100
→ 180 − 80 = 100
→ 100 = 100
→ LHS = RHS ⇒ Satisfies the equation.
Hence, the correct answer is "× and ÷".
Last updated on Jun 17, 2025
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