Divide a steel pipe with a length of 30m into two sections at a ratio of 7:8, what is the length of the longer section in m?
把长30m的钢管按7：8分成两段，较长的一段是多少m．
<gadget id="calculator">7 + 8</gadget>
<output>15</output>

<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">30 * (8/15)</gadget>
<output>16</output>

<result>16</result>