It is known that 250 kg of fresh sweet potatoes can be sun-dried to make 80 kg of sweet potato chips, and now 1.6 tons of sweet potato chips are going to be sun-dried, how many tons of fresh potatoes are needed?
已知250千克新鲜红薯可晒制80千克红薯片，现要晒制1.6吨的红薯片，需要鲜薯多少吨？
<gadget id="calculator">250 / 80</gadget>
<output>25/8 = around 3.125</output>

<gadget id="calculator">(25/8) * 1.6</gadget>
<output>5</output>

<result>5</result>