There are two bags of flour. The mass of bag A is 30kg, and the mass of bag B is (5/6) of that of bag A. If the two bags of flour are to have the same weight, how many kg should be taken from bag A?
有两袋面粉，甲袋面粉的质量是30㎏，乙袋面粉的质量是甲袋的(5/6)，如果要使两袋面粉同样重，就从甲袋面粉中取出多少㎏．
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">30 * (5/6)</gadget>
<output>25</output>

<gadget id="calculator">25 + 30</gadget>
<output>55</output>

<gadget id="calculator">55 / 2</gadget>
<output>55/2 = around 27.5</output>

<gadget id="calculator">30 - (55/2)</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>