The average of A and B is 35, A:B=2:3, B:C=7:8, what is the number of C?
甲、乙两数平均数是35，甲：乙=2：3，乙：丙=7：8，则丙数是多少．
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">35 * (2/5)</gadget>
<output>14</output>

<gadget id="calculator">14 * 3</gadget>
<output>42</output>

<gadget id="calculator">42 * 8</gadget>
<output>336</output>

<gadget id="calculator">336 / 7</gadget>
<output>48</output>

<result>48</result>