The school bought back 60 bottles of red ink and 80 bottles of blue ink. How much less red ink is than blue ink?
学校买回红墨水60瓶，蓝墨水80瓶，红墨水比蓝墨水少百分之几？
<gadget id="calculator">80 - 60</gadget>
<output>20</output>

<gadget id="calculator">20 / 80</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>