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Question

The value of $\frac{32 \div 4 - 5 \times 8 \div 3}{5 \times 3 - \{6 + 3\}}$ is:

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
$-\frac{8}{9}$

Step 1: Evaluate the Numerator

First, calculate the numerator using the order of operations (PEMDAS/BODMAS): Division and Multiplication from left to right, then Subtraction.

  • Division: $32 \div 4 = 8$
  • Multiplication: $5 \times 8 = 40$
  • Division: $40 \div 3 = \frac{40}{3}$
  • Numerator calculation: $8 - \frac{40}{3}$
  • Find a common denominator: $\frac{8 \times 3}{3} - \frac{40}{3} = \frac{24}{3} - \frac{40}{3}$
  • Subtract: $\frac{24 - 40}{3} = -\frac{16}{3}$

The value of the numerator is $-\frac{16}{3}$.

Step 2: Evaluate the Denominator

Next, calculate the denominator, again following the order of operations (PEMDAS/BODMAS): Parentheses/Brackets first, then Multiplication, then Subtraction.

  • Parentheses/Brackets: $\{6 + 3\} = 9$
  • Multiplication: $5 \times 3 = 15$
  • Denominator calculation: $15 - 9 = 6$

The value of the denominator is $6$.

Step 3: Calculate the Final Fraction

Divide the value of the numerator by the value of the denominator.

  • Fraction: $\frac{\text{Numerator}}{\text{Denominator}} = \frac{-\frac{16}{3}}{6}$
  • Simplify the complex fraction: $-\frac{16}{3} \div 6 = -\frac{16}{3 \times 6}$
  • Calculate: $-\frac{16}{18}$

Step 4: Simplify the Result

Simplify the fraction $-\frac{16}{18}$ by dividing both the numerator and the denominator by their greatest common divisor, which is 2.

  • Simplified fraction: $-\frac{16 \div 2}{18 \div 2} = -\frac{8}{9}$

The final value of the expression is $-\frac{8}{9}$.

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