There are two bottles of milk. The first bottle of milk weighs (7/8) kilograms. If you pour (1/4) kilograms from the first bottle to the second bottle, the two bottles of milk weigh the same. What is the original weight of the second bottle of milk? ．
有两瓶牛奶，第一瓶牛奶重(7/8)千克，如果从第一瓶倒(1/4)千克到第二瓶，则两瓶牛奶就一样重，第二瓶牛奶原来重多少千克．
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

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

<gadget id="calculator">(1/4) * 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(7/8) - (1/2)</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>