Teacher Zhang brought 189 yuan to the store and bought 2 basketballs and 3 footballs. It is known that a basketball is 34.5 yuan, how much is a football? (solution by equation)
张老师带了189元到商店买了2个篮球和3个足球，已知一个篮球34.5元，一个足球多少元？(用方程解)
<gadget id="calculator">34.5 * 2</gadget>
<output>69</output>

<gadget id="calculator">189 - 69</gadget>
<output>120</output>

<gadget id="calculator">120 / 3</gadget>
<output>40</output>

<result>40</result>