Question 984084
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Here is one done exactly like yours step by step.  Use this as a model.
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The ninth part of a number exceeds the fifteenth part by 8. The number is ?
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{{{expr(1/9)N}}}{{{""=""}}}{{{expr(1/15)N +8}}}

Multiply through by the least common multiple (denominator) or 9 and 15,
which is 45:

{{{45*expr(1/9)N}}}{{{""=""}}}{{{45*expr(1/15)N +45*8}}}

 {{{5N}}}{{{""=""}}}{{{3N +360}}}

 {{{2N}}}{{{""=""}}}{{{360}}}

 {{{N}}}{{{""=""}}}{{{180}}} 


Checking the answer 180:

The ninth part of 180 is {{{180/9}}} or 20
The fifteenth part of 180 is {{{180/15}}} or 12

And indeed 20 exceeds 12 by 8.

Now do your problem EXACTLY the same way.

Edwin</pre>