Question

If '\(+\)' means '\(\div\)', '\(-\)' means '\(+\)', '\(\div\)' means '\(\times\)' and '\(\times\)' means '\(-\)', then what will be the value of \(13\div15-1670 + 5 \times21 \)?

 

• A. 438
• B. 508
• C. 732
• D. 672

Answer 1

The Correct Option is B

Expression Calculation with Operation Substitution 

- The given expression is:

\[ 13 \div 15 - 1670 + 5 \times 21 \]

- Based on the given rules, we replace the operations as follows:

• "÷" means "×"
• "−" means "+"
• "×" means "−"
• "+" means "÷"

- Substituting the new operations, the expression becomes:

\[ 13 \times 15 + 1670 \div 5 - 21 \]

- Step 1: Calculate \( 13 \times 15 \)

\[ 13 \times 15 = 195 \]

- Step 2: Calculate \( 1670 \div 5 \)

\[ 1670 \div 5 = 334 \]

- Step 3: Combine the results:

\[ 195 + 334 - 21 \]

- Step 4: Perform the final calculations:

\[ 195 + 334 = 529 \] \[ 529 - 21 = 508 \]

Conclusion: The value of the expression is 508.