What will come in the place of ‘?’ in the following equation, if ‘+’ and ‘–’…
2024
What will come in the place of ‘?’ in the following equation, if ‘+’ and ‘–’ are interchanged and ‘×’ and ‘÷’ are interchanged?
5 – 4 ÷ 9 + 80 × 10 = ?
- A.
33
- B.
30
- C.
35
- D.
31
Attempted by 2 students.
Show answer & explanation
Correct answer: A
Understand the operator changes:
Interchange '+' and '-'
Interchange 'x' and '÷'
Rewrite the equation:
Original equation: 5 - 4 ÷ 9 + 80 x 10
Applying the changes:
'-' becomes '+'
'÷' becomes 'x'
'+' becomes '-'
'x' becomes '÷'
New equation: 5 + 4 x 9 - 80 ÷ 10
Solve using BODMAS:
Division: 80 ÷ 10 = 8.
Equation becomes: 5 + 4 x 9 - 8
Multiplication: 4 x 9 = 36.
Equation becomes: 5 + 36 - 8
Addition and Subtraction: 5 + 36 = 41; 41 - 8 = 33.