Yanna baked twenty butter cookies and forty biscuits in the morning.  In the afternoon, she baked ten butter cookies and twenty biscuits. How many more biscuits did she bake than butter cookies?
There were 20 + 10 = 
<gadget id="calculator">20+10</gadget>
<output>30</output>
30 butter cookies.
And, there were 40 + 20 = 
<gadget id="calculator">40+20</gadget>
<output>60</output>
60 biscuits.
Therefore, she baked 60 - 30 = 
<gadget id="calculator">60-30</gadget>
<output>30</output>
30 more biscuits than butter cookies.

<result>30</result>