Jim reads at a rate of 40 pages an hour.  He reads a total of 600 pages per week.  He increases his reading speed to 150% of its former speed but reads 4 hours less per week.  How many pages does he read a week now?
He read 600/40=
<gadget id="calculator">600/40</gadget>
<output>15</output>
15 hours per week.
So now he reads 15-4=
<gadget id="calculator">15-4</gadget>
<output>11</output>
11 hours per week.
She now reads 40*1.5=
<gadget id="calculator">40*1.5</gadget>
<output>60</output>
60 pages per hour.
So she reads 11*60=
<gadget id="calculator">11*60</gadget>
<output>660</output>
660 pages per week.

<result>660</result>