In response to the call for energy conservation and emission reduction, No. 1 Primary School carried out water-saving activities, saving an average of 100 kilograms of water per day. How many tons of water were saved in the first quarter of this year?
第一小学为了响应节能减排的号召，开展节水活动，平均每天节水大约100千克，今年第一季度共节约用水多少吨？
<gadget id="calculator">31 + 28 + 31</gadget>
<output>90</output>

<gadget id="calculator">90 / 1_000</gadget>
<output>9/100 = around 0.09</output>

<gadget id="calculator">100 * (9/100)</gadget>
<output>9</output>

<result>9</result>