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Determination of Significant Digits in a Number

If * means ...

Question

If $$ means adding $6$ times the second number to the first number the $(1 2) * 3$ equals ?

121

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31

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93

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91

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Solution

The correct option is B $31$
$1 * 2 = 1 + 2$ $\times$ $6 = 1 + 12 = 13$
$(1 * 2) * 3 = 13 * 3 = 13 + 3$ $\times 6$
$= 13 + 18 = 31$

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