An alloy of tin and lead weighs 45 kg, of which 27 kg is lead. Find the lead content of this alloy.
一块锡和铅的合金重45千克，其中铅27千克，求这块合金的含铅率．
<gadget id="calculator">27 / 45</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(3/5) * 1</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>