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RELATIONS AND FUNCTIONS — MATHS STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceMATHSRELATIONS AND FUNCTIONS1 Mark
Question
Let $_*$ be a binary operation, on the set of all non$-$zero real numbers, given by $a _{*} b = \frac{\text{ab}}{5}$ for all $a, b \in R - \{0\}.$ Find the value of $x,$ given that $2 _* (x _* 5) = 10.$
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Answer

$x = 25.$

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