Aunt Wang bought 3 catties of apples and 4 catties of bananas at Jiajia Supermarket, which cost 18 yuan. The price of 1 catty of apples is equivalent to the price of 2 catties of bananas. How much is a catty of apples?
王阿姨在佳佳超市买了3斤苹果和4斤香蕉，共用了18元，而1斤苹果的价钱相当于2斤香蕉的价钱，每斤苹果多少元．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">18 / 5</gadget>
<output>18/5 = around 3.6</output>

<result>18/5 = around 3.6</result>