Divide 120 into three parts, A, B, and C. A is 30. The ratio of B to C is 1:5. What is C?
将120分成甲乙丙三份，甲是30，乙和丙的比是1：5，丙是多少
<gadget id="calculator">120 - 30</gadget>
<output>90</output>

<gadget id="calculator">1 + 5</gadget>
<output>6</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">90 * (5/6)</gadget>
<output>75</output>

<result>75</result>