There are several stamps with a total face value of 1460 yuan, among which the number of stamps with a face value of 80 cents accounts for 25% of the total number, the number of stamps with a face value of 3 yuan accounts for 20% of the total number, and the rest are face value 1.2 yuan of stamps. How many stamps with a face value of 1.2 yuan are there in the existing stamps?
现有邮票若干张，总面值共计1460元，其中面值为80分的邮票张数占总张数的25%，面值为3元的邮票张数占总张数的20%，其余都是面值为1.2元的邮票．现有邮票中面值为1.2元的邮票共有多少张．
<gadget id="calculator">0.2 + 0.6 + 0.66</gadget>
<output>1.46</output>

<gadget id="calculator">1_460 / 1.46</gadget>
<output>1_000</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/4) - (1/5)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">1_000 * (11/20)</gadget>
<output>550</output>

<result>550</result>