There are 147 bridges of different sizes distributed on the Fourth Ring Road in Beijing. Among them, the number of overpasses accounts for (17/49) of the total number of bridges, and the number of pedestrian bridges accounts for (2/7) of the total number of bridges. How many of these two types of bridges are there?
北京四环路上分布着不同规模的桥梁147座．其中立交桥数量占桥梁总数的(17/49)，人行天桥占桥梁总数的(2/7)，这两种桥共有多少座？
<gadget id="calculator">17 / 49</gadget>
<output>17/49 = around 0.346939</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(17/49) + (2/7)</gadget>
<output>31/49 = around 0.632653</output>

<gadget id="calculator">147 * (31/49)</gadget>
<output>93</output>

<result>93</result>