There are 15 white cranes in the zoo, and 12 red-crowned cranes are 7 times more than white cranes. How many red-crowned cranes are there?
动物园里有白鹤15只，丹顶鹤比白鹤的7倍多12只，丹顶鹤有多少只？
<gadget id="calculator">15 * 7</gadget>
<output>105</output>

<gadget id="calculator">105 + 12</gadget>
<output>117</output>

<result>117</result>