Five consecutive natural numbers, the third number is 1 more than the sum of the first and fifth numbers (7/15), then what is the sum of these five numbers?
五个连续的自然数，其中第三个数比第一、五两数和的(7/15)多1，那么这五个数的和是多少？
<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">2 * (7/15)</gadget>
<output>14/15 = around 0.933333</output>

<gadget id="calculator">1 - (14/15)</gadget>
<output>1/15 = around 0.066667</output>

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

<gadget id="calculator">5 * 15</gadget>
<output>75</output>

<result>75</result>