For a barrel of oil, 40% of the first time out, and 37.5% out in the second time, a total of 77.5 kg out of the two times. How many kilograms is this barrel of oil originally?
一桶油，第一次到出40%，第二次到出37.5%，两次共到出77.5千克．这桶油原来有多少千克？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">37.5 / 100</gadget>
<output>0.375</output>

<gadget id="calculator">(2/5) + 0.375</gadget>
<output>0.775</output>

<gadget id="calculator">77.5 / 0.775</gadget>
<output>100</output>

<result>100</result>