Cut a 4.2-meter-long rope into two sections, the ratio of one section to the other section is 5:2, at what meter should it be cut.
把一根长4.2米的绳子截成两段，其中一段与另一段之比是5：2，应在多少米处截断．
<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">4.2 * (2/7)</gadget>
<output>1.2</output>

<result>1.2</result>