Xidajie Elementary School carried out water conservation activities, saving a total of 315 tons of water in the first three months. According to this calculation, how many tons of water can the school save a year?
西大街小学校开展节约用水活动，前3个月共节约用水315吨．照这样计算，学校一年能节约用水多少吨？
<gadget id="calculator">315 / 3</gadget>
<output>105</output>

<gadget id="calculator">105 * 12</gadget>
<output>1_260</output>

<result>1_260</result>