A: B = 3: 8, A is 100 less than B, then B = how much
甲：乙=3：8，甲比乙少100，则乙=多少
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (3/8)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">100 / (5/8)</gadget>
<output>160</output>

<result>160</result>