If trees are planted by a 270-meter-long water channel, one tree is planted every 3 meters, and both ends are planted, how many trees are planted in total?
在一条长270米的水渠边植树，每隔3米植一棵，两端都植，则共植树多少棵．
<gadget id="calculator">270 / 3</gadget>
<output>90</output>

<gadget id="calculator">90 + 1</gadget>
<output>91</output>

<result>91</result>