Subtract the sum of 22.7 and 7.2 from 52.4, divide the difference by 4.5, what is the quotient?
52.4减去22.7与7.2的和，所得的差除以4.5，商是多少？
<gadget id="calculator">22.7 + 7.2</gadget>
<output>29.9</output>

<gadget id="calculator">52.4 - 29.9</gadget>
<output>22.5</output>

<gadget id="calculator">22.5 / 4.5</gadget>
<output>5</output>

<result>5</result>