Xiaohong's family used to use 10 tons of water per month, but after replacing the water-saving faucet, they used 9 tons of water per month. Now, how much water is saved every month compared to before.
小红家原来每月用水10吨，更换了节水龙头后每月用水9吨，现在每月用水比原来节约了多少．
<gadget id="calculator">10 - 9</gadget>
<output>1</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>