There are two bags of rice, A and B, and bag A has 35 kilograms. If 15 kilograms are taken out from bag B and poured into bag A, then the rice in bag A is 5/7 of that in bag B. How many kilograms of rice does bag B contain?
甲、乙两袋大米，甲袋有35千克，如果从乙袋中取出15千克倒入甲袋，这时甲袋大米是乙袋的(5/7)，乙袋原来有大米多少千克？
<gadget id="calculator">35 + 15</gadget>
<output>50</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">50 / (5/7)</gadget>
<output>70</output>

<gadget id="calculator">70 + 15</gadget>
<output>85</output>

<result>85</result>