A chicken can lay one egg per day. Grandma Wang raised 15 hens and 5 roosters. How many eggs can she lay in a week?
一只鸡每天能下一个蛋，王奶奶家养了15只母鸡和5只公鸡，一星期一共能下多少个蛋？
<gadget id="calculator">15 * 7</gadget>
<output>105</output>

<result>105</result>