Each purple book has 230 pages. Each orange book contains 510 pages. Mirella read 5 purple books and 4 orange books. How many more orange pages did she read than purple pages?
Purple = 5 * 230 = 
<gadget id="calculator">5*230</gadget>
<output>1_150</output>
1150 pages.
Orange = 4 * 510 = 
<gadget id="calculator">4*510</gadget>
<output>2_040</output>
2040 pages
2040 - 1150 = 
<gadget id="calculator">2040-1150</gadget>
<output>890</output>
890.
Mirella read 890 more orange pages than purple pages.

<result>890</result>