Xiaogang went to buy milk and found that the milk was on special price this week, 0.9 yuan per bag, buy two get one free. Xiaogang has 5.4 yuan, how many bags of milk can he buy at most.
小刚去买牛奶，发现牛奶本周特价，每袋0.9元，买二送一．小刚有5.4元，最多可以买多少袋奶．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">0.9 * (2/3)</gadget>
<output>0.6</output>

<gadget id="calculator">5.4 / 0.6</gadget>
<output>9</output>

<result>9</result>