A box of toothpaste is 4.7 yuan, which is 1.2 yuan more expensive than a toothbrush. How much does it cost to buy a toothbrush?
一盒牙膏4.7元，比一个牙刷贵1.2元．买一个牙刷需要多少元．
<gadget id="calculator">4.7 - 1.2</gadget>
<output>3.5</output>

<result>3.5</result>