The school bought a total of 105 basketballs and footballs, of which the number of footballs is 3 less than the total (3/7). How many footballs did the school buy?
学校买来篮球和足球共105个，其中足球的数量比总数的(3/7)还少3个，学校买来足球多少个？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">105 * (3/7)</gadget>
<output>45</output>

<gadget id="calculator">45 - 3</gadget>
<output>42</output>

<result>42</result>