The school breeding group has 15 rabbits, of which (1/3) are black rabbits, how many black rabbits are there?
学校饲养组养了15只兔子，其中(1/3)是黑兔，黑兔有多少只？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">15 * (1/3)</gadget>
<output>5</output>

<result>5</result>