A certain number should be multiplied by (2/5), but the reciprocal of (2/5) is multiplied by mistake. The result is (8/15), what is the number
某数应该乘(2/5)，却错乘了(2/5)的倒数，得数是(8/15)，这个数是多少
<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / (2/5)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(8/15) / (5/2)</gadget>
<output>16/75 = around 0.213333</output>

<result>16/75 = around 0.213333</result>