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Question

If \(23 \times 31 = 713\), then \(0.00713 \div 3.1\) is equal to:

This question was previously asked in
RRB Group D 2018 Question Paper (22-Sep-2018) (Shift 1)
The correct answer is

0.0023

Step 1 — Rewrite: \(0.00713 \div 3.1 = \dfrac{0.00713}{3.1} = \dfrac{713}{3.1 \times 10^5}\).

Step 2 — Using \(23 \times 31 = 713\), we get \(\dfrac{713}{31} = 23\). Therefore \(\dfrac{713}{3.1 \times 10^5} = \dfrac{23}{10^4} = 0.0023\).

Hence, 0.0023.

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