4 kilograms of apples are equal to the price of 5 kilograms of pears. Pears are 2.5 yuan per kilogram. If you buy 18 kilograms of apples for 100 yuan, how much should you get back?
4千克苹果等于5千克梨的价钱，梨每千克2.5元，用100元钱买18千克苹果，应找回多少元？
<gadget id="calculator">2.5 / 4</gadget>
<output>0.625</output>

<gadget id="calculator">5 * 0.625 * 18</gadget>
<output>56.25</output>

<gadget id="calculator">100 - 56.25</gadget>
<output>43.75</output>

<result>43.75</result>