There are four ribbons of red, yellow, blue and green, the red one is (2/5) meters longer than the yellow one, the yellow one is (1/10) meters longer than the green one, and (1/10) meters longer than the blue one The root is short (3/4) meters. Children, which color ribbon is the longest? Which color ribbon is the shortest? How many meters is the difference between the two?
有红、黄、蓝、绿四根彩带，红的一根比黄的一根长(2/5)米，黄的一根比绿的一根长(1/10)米，比蓝的一根短(3/4)米．小朋友，哪种颜色的彩带最长？哪种颜色的彩带最短？二者相差多少米？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(3/4) + (1/10)</gadget>
<output>17/20 = around 0.85</output>

<result>17/20 = around 0.85</result>