There are several bonsai in three shapes, A, B, and C, placed in a pedestrian street. Type A bonsai consists of 15 red flowers, 24 yellow flowers and 25 purple flowers. Type B bonsai consists of 10 red flowers and 12 yellow flowers. Type C bonsai consists of 10 red flowers, 18 yellow flowers and 25 purple flowers. These bonsai share a total of 2900 red flowers and 3500 purple flowers, how many yellow flowers are used in total?
某步行街摆放有若干盆甲、乙、丙三种造型的盆景．甲种盆景由15朵红花、24朵黄花和25朵紫花搭配而成．乙种盆景由10朵红花、12朵黄花搭配而成．丙种盆景由10朵红花、18朵黄花和25朵紫花搭配而成．这些盆景一共用了2900朵红花，3500朵紫花，则黄花一共用了多少朵？
<gadget id="calculator">580 + 140</gadget>
<output>720</output>

<gadget id="calculator">6 * 720</gadget>
<output>4_320</output>

<result>4_320</result>