To commemorate the revolutionary martyrs, the students of Hope Primary School tied 720 white and yellow flowers in the early stage of Qingming Festival. The ratio of white flowers to yellow flowers was 7:2. The students also tied some white flowers. At this time, the ratio of white flowers to yellow flowers was 15:3. How many flowers did they make in total?
为缅怀革命先烈，清明节前期希望小学的同学一共扎白花和黄花720朵，白花与黄花的比是7：2，同学们又扎了一些白花，这时白花与黄花的比为15：3，他们一共扎了多少朵花？
<gadget id="calculator">7 + 2</gadget>
<output>9</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">15 + 3</gadget>
<output>18</output>

<gadget id="calculator">3 / 18</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(2/9) / (1/6)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">720 * (4/3)</gadget>
<output>960</output>

<result>960</result>