The school has a total of 65 football and blue balls. The ratio of footballs to basketballs is 1:4. This year, some footballs were bought back. At this time, the ratio of footballs to basketballs is 3:4. How many footballs were bought this year?
学校有足球蓝球共65个，其中足球和蓝球数量比是1：4，今年又买回一些足球，这时足球和篮球数量比是3：4，今年买回足球多少个？
<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(4/5) / (4/7)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">65 * (7/5)</gadget>
<output>91</output>

<gadget id="calculator">91 - 65</gadget>
<output>26</output>

<result>26</result>