To weave a batch of cloth, we weave (1/5) of the total number on the first day, and weave 100 meters on the second day, leaving (7/15) of the total number. How many meters is this batch of cloth?
织一批布，第一天织了总数的(1/5)，第二天织了100米，还剩下总数的(7/15)．这批布一共多少米？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">1 - (1/5) - (7/15)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">100 / (1/3)</gadget>
<output>300</output>

<result>300</result>