Roland needs a length of thread to complete an exercise. He has a 12cm long thread but his teacher says he needs an additional three-quarters of what he has. What is the total length required?
An additional three-quarters of 12cm is needed which is 12cm*(3/4) = 
<gadget id="calculator">12*(3/4)</gadget>
<output>9</output>
9cm.
The total length required is 12cm+9cm = 
<gadget id="calculator">12+9</gadget>
<output>21</output>
21cm.

<result>21</result>