There is a batch of toys, the quantity transported away on the first day is 1/3 of the total number, and 450 pieces are transported away on the second day, which is exactly half of the total number in two days. How many toys were shipped on the first day?
有一批玩具，第一天运走的数量是总数的(1/3)，第二天运走450件，两天正好运走总数的一半．第一天运走了多少件玩具？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/2) - (1/3)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">450 / (1/6)</gadget>
<output>2_700</output>

<gadget id="calculator">2_700 * (1/3)</gadget>
<output>900</output>

<result>900</result>