James takes a spinning class 3 times a week.  He works out for 1.5 hours each class and burns 7 calories per minute.  How many calories does he burn per week?
He works out for 1.5*60=
<gadget id="calculator">1.5*60</gadget>
<output>90</output>
90 minutes per class.
So he burns 90*7=
<gadget id="calculator">90*7</gadget>
<output>630</output>
630 calories per class.
That means he burns 630*3=
<gadget id="calculator">630*3</gadget>
<output>1_890</output>
1890 calories per week.

<result>1_890</result>