Xiao Ming goes to buy Coca-Cola drinks, and the money he brings is 1 yuan for buying 3 bottles, and 7 yuan for buying 5 bottles, so how much is each bottle of drink?
小明去买可乐饮料，他所带的钱买3瓶就余1元，买五瓶就差7元，那么每瓶饮料多少元．
<gadget id="calculator">7 + 1</gadget>
<output>8</output>

<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<result>4</result>