Alex has some new shirts. Joe has 3 more new shirts than Alex. Ben has eight more new shirts than Joe. If Ben has 15 new shirts, how many new shirts does Alex have?
Joe has 15-8=
<gadget id="calculator">15-8</gadget>
<output>7</output>
7 new shirts.
Alex has 7-3=
<gadget id="calculator">7-3</gadget>
<output>4</output>
4 new shirts.

<result>4</result>