The price of 4 desks can buy 5 chairs, each chair is 40 yuan, how much is each desk?
4张课桌的价钱可以买5把椅子，每把椅子40元，每张桌子多少元？
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">40 * (5/4)</gadget>
<output>50</output>

<result>50</result>