There are 8 black rabbits in the school breeding group, 7 times the number of white rabbits, and 15 fewer gray rabbits than white rabbits. How many gray rabbits are there?
学校饲养小组有黑兔8只，白兔的只数是黑兔的7倍，灰兔比白兔少15只，灰兔有多少只？
<gadget id="calculator">8 * 7</gadget>
<output>56</output>

<gadget id="calculator">56 - 15</gadget>
<output>41</output>

<result>41</result>