The school plans to buy 24 basketballs at 35 yuan each. If the same amount of money is used to buy volleyballs, and the unit price of volleyballs is 21 yuan each, how many volleyballs can one buy?
学校计划买24个篮球，每个篮球35元．如果用同样多的钱买排球，排球的单价是每个21元，能买多少个排球？
<gadget id="calculator">24 / 21</gadget>
<output>8/7 = around 1.142857</output>

<gadget id="calculator">35 * (8/7)</gadget>
<output>40</output>

<result>40</result>