There are 387 tons of chemical fertilizers in the warehouse, 142 tons were shipped out yesterday morning, and 158 tons were shipped out in the afternoon. How many tons of fertilizer are left in the warehouse? (please use two methods to answer)
仓库共存化肥387吨，昨天上午运出142吨，下午运出158吨．仓库还剩下化肥多少吨？(请用两种方法解答)
<gadget id="calculator">387 - 142 - 158</gadget>
<output>87</output>

<result>87</result>