There are 25 volleyballs in the sports room, twice as many basketballs as there are volleyballs, and 20 more small balls than three times as many basketballs. How many little balls are there?
体育室有排球25只，篮球的只数是排球的2倍，小皮球的只数比篮球的3倍多20只．小皮球有多少只？
<gadget id="calculator">25 * 2</gadget>
<output>50</output>

<gadget id="calculator">50 * 3</gadget>
<output>150</output>

<gadget id="calculator">150 + 20</gadget>
<output>170</output>

<result>170</result>