How many three-digit numbers have the sum of the digits in each digit equal to 15?
各数位上数码之和是15的三位数共有多少个．
<gadget id="calculator">5 + 6 + 7 + 8 + 9 + 10 + 9 + 8 + 7</gadget>
<output>69</output>

<result>69</result>