There are five phones on a phone plan. The main phone costs twice as much as each additional phone. If the main phone plan costs $20, how much does the whole phone plan cost?
Each additional phone costs 20 / 2 = $
<gadget id="calculator">20/2</gadget>
<output>10</output>
10.
Thus, the four additional phones cost 4 * 10 = $
<gadget id="calculator">4*10</gadget>
<output>40</output>
40 in all.
Thus, the whole phone plan cost $40 + $20 = $
<gadget id="calculator">40+20</gadget>
<output>60</output>
60.

<result>60</result>