There are 63 basketballs and footballs in the school sports room. The number of basketballs is 4/5 that of footballs. How many footballs did the school buy? (Solution of column equation)
学校体育室有篮球、足球共63个，篮球的数量是足球的(4/5)，学校买来足球多少个？(列方程解)
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 + (4/5)</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">63 / (9/5)</gadget>
<output>35</output>

<result>35</result>