The school has 36 footballs and basketballs, the ratio of footballs to basketballs is 7:2, after buying 10 footballs, how much do footballs account for in the total?
学校有足球和篮球共36个，足球与篮球的比是7：2，又买进10个足球后，足球占总数的多少．
<gadget id="calculator">7 + 2</gadget>
<output>9</output>

<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">36 * (7/9)</gadget>
<output>28</output>

<gadget id="calculator">28 + 10</gadget>
<output>38</output>

<gadget id="calculator">36 + 10</gadget>
<output>46</output>

<gadget id="calculator">38 / 46</gadget>
<output>19/23 = around 0.826087</output>

<result>19/23 = around 0.826087</result>