RRB NTPC · Question 95
If the mathematical operator ‘+’ means division, ‘-‘ means multiplication, ‘×’ means subtraction and ‘÷’ means addition, then the value of 1 × 7 + 21 × 2 ÷ 2 + 3 – 4 is A. 8/3 B. 4/3 C. - 4/3 D. - 8/3
Show answer & explanation
Answer: (A) B
Explanation
Replacing the operators, 1 × 7 + 21 × 2 ÷ 2 + 3 − 4 becomes 1 − 7 ÷ 21 − 2 + 2 ÷ 3 × 4. Division and multiplication first: 7 ÷ 21 = 1/3, and 2 ÷ 3 × 4 = 8/3. Then 1 − 1/3 − 2 + 8/3 = (3 − 1 − 6 + 8)/3 = 4/3.