There are red, yellow and blue balls in the bag, the number of yellow balls is 4/5 of red balls, the number of blue balls is 2/3 of red balls, and the number of yellow balls is 3/4 2 less than the blue balls, how many balls are there in the bag?
袋子里有红黄蓝三种颜色的球，黄球个数是红球的(4/5)，蓝球个数是红球的(2/3)，黄球个数的(3/4)比蓝球少2个，袋子里共有多少个球？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(4/5) * (3/4)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(2/3) - (3/5)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">2 / (1/15)</gadget>
<output>30</output>

<gadget id="calculator">30 * (4/5)</gadget>
<output>24</output>

<gadget id="calculator">30 * (2/3)</gadget>
<output>20</output>

<gadget id="calculator">24 + 20 + 30</gadget>
<output>74</output>

<result>74</result>