Every 2 years, the number of swans at Rita's pond doubles. Currently, there are 15 swans in the pond. How many swans will there be in ten years?
If currently there are 15 swans in the pond, in two years' time there will be 15*2=
<gadget id="calculator">15*2</gadget>
<output>30</output>
30 swans.
In another two years, the number of swans in the pond will double to 2*30=
<gadget id="calculator">2*30</gadget>
<output>60</output>
60 swans.
In another two years, the number of swans in the pond will double to 2*60=
<gadget id="calculator">2*60</gadget>
<output>120</output>
120 swans.
If after 6 years there are 120 swans in the pond, in eight years times there will be 2*120=240 swans.
In another two years, which is 10 years, there will be 2*240=
<gadget id="calculator">2*240</gadget>
<output>480</output>
480 swans in the pond.

<result>480</result>