Question

can you tell me please that how (d/20)+(d/30)becomes (d/12) ?

Answer 1

Answer:

$= > \frac{d}{20} + \frac{d}{30} \\ = > \frac{3d + 2d}{60} \\ = > \: \frac{5d}{60} \\ = > \frac{d}{12}$

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