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Correct the given equations by interchanging the two signs (10 - 14 ÷ 7 x 3 + 4 = 20)
  • a)
    - and +
  • b)
    + and x
  • c)
    ÷ and +
  • d)
    ÷ and x
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Correct the given equations by interchanging the two signs (10 - 14 &d...
Interchange of sign + and x makes the equation into 10 – 14 ÷ 7 + 3 x 4 = 10 - 2 + 3 × 4 = 20. Hence, option (b) is the correct answer.
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Community Answer
Correct the given equations by interchanging the two signs (10 - 14 &d...
Understanding the Given Equation
The original equation is:
10 - 14 ÷ 7 x 3 + 4 = 20
To evaluate the correctness, we will follow the order of operations (PEMDAS/BODMAS).
Step-by-Step Calculation
1. Division and Multiplication (from left to right):
- 14 ÷ 7 = 2
- 2 x 3 = 6
Now, substituting back into the equation:
- 10 - 6 + 4
2. Addition and Subtraction (from left to right):
- 10 - 6 = 4
- 4 + 4 = 8
Thus, the left-hand side equals 8, not 20.
Explaining the Correction
To correct the equation, we interchange the signs. The option chosen is (b) + and x:
- Replace + with x and x with +:
New equation:
10 - 14 ÷ 7 + 3 x 4 = 20
Re-evaluating the New Equation
1. Perform Division:
- 14 ÷ 7 = 2
2. Substitute:
- 10 - 2 + 3 x 4
3. Perform Multiplication:
- 3 x 4 = 12
4. Final Calculation:
- 10 - 2 + 12
- 10 - 2 = 8
- 8 + 12 = 20
Conclusion
The new equation 10 - 14 ÷ 7 + 3 x 4 = 20 holds true after the sign interchange. Therefore, option (b) is correct.
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