The school bought some footballs and basketballs. It is known that buying 3 footballs and 5 basketballs cost 281 yuan; buying 3 footballs and 7 basketballs cost 355 yuan. Then how much is a basketball.
学校买来一些足球和篮球．已知买3个足球和5个篮球花了281元；买3个足球和7个篮球花了355元．则1个篮球多少元．
<gadget id="calculator">355 - 281</gadget>
<output>74</output>

<gadget id="calculator">7 - 5</gadget>
<output>2</output>

<gadget id="calculator">74 / 2</gadget>
<output>37</output>

<result>37</result>