My family needs to buy a box of milk and a bag of soy milk every day. The milk is 4 yuan per box, and the soy milk is 2 yuan per bag. How much does it cost to buy milk and soy milk in a week?
我家每天要买一盒牛奶和一袋豆浆，牛奶每盒4元，豆浆每袋2元，一星期买牛奶和豆浆要花多少钱？
<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<gadget id="calculator">6 * 7</gadget>
<output>42</output>

<result>42</result>