There was only enough room for 21 people on a raft if no one wore life jackets. There were 7 fewer people who could fit on the raft if everyone wore life jackets. If 8 people on the raft needed life jackets, how many people could fit on the raft?
If everyone wore life jackets, only 21-7=
<gadget id="calculator">21-7</gadget>
<output>14</output>
14 people could fit on the raft.
For every person less on the raft, 14/7=
<gadget id="calculator">14/7</gadget>
<output>2</output>
2 life jackets could fit.
For 8 life jackets, 8/2=
<gadget id="calculator">8/2</gadget>
<output>4</output>
4 less people could fit.
21-4=
<gadget id="calculator">21-4</gadget>
<output>17</output>
17 people could fit on the raft.

<result>17</result>