There are 50 male passengers on the ship. If the number is reduced by 10%, it is exactly equal to the number of female passengers (3/5). How many female passengers are there on the ship?
轮船上有男乘客50人，若减少10%，恰好与女乘客的(3/5)相等，轮船上女乘客有多少人？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">(3/5) / (9/10)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">50 / (2/3)</gadget>
<output>75</output>

<result>75</result>