There are three bags of rice, and bag A accounts for 13/45 of the total. If bag B gives bag A 4 kilograms, the weight of the three bags is equal. How many kilograms are there in total?
有三袋大米，甲袋占总量的(13/45)，如果乙袋给甲袋4千克，则三袋重量相等，原来共有多少千克？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">13 / 45</gadget>
<output>13/45 = around 0.288889</output>

<gadget id="calculator">(1/3) - (13/45)</gadget>
<output>2/45 = around 0.044444</output>

<gadget id="calculator">4 / (2/45)</gadget>
<output>90</output>

<result>90</result>