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RELATIONS AND FUNCTIONS — Maths STD 12 Science — Question

Gujarat 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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