The school buys a long rope and cuts it to make a skipping rope. It takes 16 meters to make a short skipping rope and 14 meters to make a long skipping rope. The ratio of the rest to the used one is 1:3.
学校买一根长绳截开做跳绳，做短跳绳用去16米，做长跳绳用去14米，剩下的与用去的比是1：3，这根长绳原来长多少？
<gadget id="calculator">14 + 16</gadget>
<output>30</output>

<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">30 / (3/4)</gadget>
<output>40</output>

<result>40</result>