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Railways PYQCBT 1 2016

RRB NTPC · Question 31

If the mathematical operator ‘÷’ means ‘×’, ‘+’ means ‘-’, ‘×’ means ‘+’ and ‘_’ means ‘÷’, then 25 + 18 – 3 × 7 ÷ 3 = ?

  1. 25

  2. 21

  3. 19

  4. 40

Show answer & explanation

Answer: (D) 40

Explanation

With '÷' → ×, '+' → −, '×' → + and '−' → ÷, the expression 25 + 18 − 3 × 7 ÷ 3 becomes 25 − 18 ÷ 3 + 7 × 3. Division and multiplication first: 18 ÷ 3 = 6 and 7 × 3 = 21. Then 25 − 6 + 21 = 40.