Question 258218
<pre>
three times a number increased by twenty

Write three as 3, and twenty as 20

    3 times a number increased by 20

Write N instead of "a number"

      3 times N increased by 20

Write 3N instead of "3 times N"

            3N increased by 20

To increase by 20 is to add 20, and to add 20 we write + 20
So write "+ 20" insteda of "increased by 20"

             3N + 20

That's it!

Edwin</pre>