Haiming Primary School bought 15 footballs and 75 skipping ropes, which cost 780 yuan. Each football is 46 yuan. How much is each skipping rope? (solution by equation)
海明小学买来15个足球和75根跳绳，共用了780元，足球每个46元，每根跳绳多少元？(用方程解)
<gadget id="calculator">46 * 15</gadget>
<output>690</output>

<gadget id="calculator">780 - 690</gadget>
<output>90</output>

<gadget id="calculator">90 / 75</gadget>
<output>6/5 = around 1.2</output>

<result>6/5 = around 1.2</result>