Question 766221
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It's quite simple if you write down the fraction clearly and do some simple
factorization:

{{{((r+2)/20) * ((5/(12*r+24)))}}}

Factor out the common factor of 12 from the denominator of the 2nd fraction

= {{{((r+2)/20)* (5/(12*(r+2)))}}}

The two (r+2) terms cancel out

= {{{(cross(r+2)/20)* (5/(12*cross((r+2))))}}}

Now we have only numbers to simplify

= {{{5/240 = 1/48}}}

Hope you got it. Let me know if it is not clear :)

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