Mrs. Chen’s house was decorated for a new house, and he bought a batch of ceramic tiles, all (3/8) were shipped for the first time, and 50 pieces were shipped for the second time. It is known that the ratio of the number of tiles shipped at this time to the number of tiles not shipped 5:7, how many bricks are still not shipped?
陈老师家里装修新房，买了一批瓷砖，第一次运来了全部的(3/8)，第二次运来了50块，已知这时运来的与没运来的块数比是5：7，还有多少块砖没有运来？
<gadget id="calculator">5 + 7</gadget>
<output>12</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(5/12) - (3/8)</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">50 / (1/24)</gadget>
<output>1_200</output>

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">1_200 * (7/12)</gadget>
<output>700</output>

<result>700</result>