The seats of a certain concert are divided into two areas, the first floor and the second floor. If the ratio of sold seats to unsold seats on the first floor is 7:2. The ratio of sold seats to unsold seats on the second floor is 5:4, and the number of seats sold on the first floor and the second floor is equal. Then the number of seats sold in this concert accounts for the total number of seats.
某场演唱会的座位分成一楼和二楼两个区域，若一楼售出与未售出的座位之比为7：2．二楼售出与未售出的座位之比为5：4，且一楼和二楼售出的座位数相等．则此场音乐会售出的座位数占总数的多少．
<gadget id="calculator">35 / 64</gadget>
<output>35/64 = around 0.546875</output>

<result>35/64 = around 0.546875</result>