A bag of milk is 4 yuan, a bag of soy milk is 2 yuan, my family buys a box of milk and a bag of soy milk every day. How much does it cost to buy milk and soy milk a week?
一袋牛奶4元，一袋豆浆2元，我家每天买一盒牛奶和一袋豆浆．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>