Give A, B, and C three apples, A and B are 5:4, B and C are 6:5, so A has 15 more apples than C. How many armors are there?
给甲、乙、丙三个小朋友分苹果，甲和乙是5：4，乙和丙是6：5，这样甲比丙就多15个．甲是多少个．
<gadget id="calculator">15 - 10</gadget>
<output>5</output>

<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<gadget id="calculator">3 * 15</gadget>
<output>45</output>

<result>45</result>