It’s Chinese New Year, and WeChat is popular to “grab red envelopes”. Red envelopes are divided into three types: big red envelopes, medium red envelopes, and small red envelopes. The same kind of red envelopes contain the same amount of money (assuming that the amount of money that each type of red envelope can grab is an integer). Yingying, Xinxin and Niannian grabbed a total of 9 red envelopes, which happened to be 3 of each type, large, medium, and small. Yingying grabbed 4 red envelopes and received a total of 25 yuan; Xinxin grabbed 3 red envelopes. I also got 25 yuan; I only got 2 red envelopes every year, and I got 7 yuan. Then, what is the product of the 3 money amounts contained in the 3 kinds of red envelopes?
过年了，微信流行"抢红包"，红包分为大红包、中红包、小红包3种，同种红包所含钱数相同(假设每种红包所能抢到的钱数都是整数元)．迎迎、新新和年年3人共抢到9个红包，恰好是大、中、小每种3个，迎迎抢到了4个红包，共获得25元；新新抢到了3个红包，也获得了25元；年年只枪到了2个红包，获得了7元．那么，3种红包内所含的3个钱数的乘积是多少元．
<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">19 - 7</gadget>
<output>12</output>

<gadget id="calculator">1 * 6 * 12</gadget>
<output>72</output>

<result>72</result>