There are 36 white rabbits and 69 black rabbits, and the number of gray rabbits is three times the total number of white rabbits and black rabbits. How many gray rabbits are there?
白兔有36只，黑兔有69只，灰兔的只数是白兔和黑兔总数的3倍．灰兔有多少只？
<gadget id="calculator">36 + 69</gadget>
<output>105</output>

<gadget id="calculator">105 * 3</gadget>
<output>315</output>

<result>315</result>