The stationery store shipped in a batch of red and blue ink, including 65 boxes of red ink. When 25 boxes of red ink are sold and 20% of blue ink is sold, the remaining red and blue inks are equal. How many boxes of blue ink are there in the original shipment?
文具店运进一批红、蓝墨水，其中红墨水65箱．当红墨水售出25箱，蓝墨水售出20%后，剩下的红蓝墨水相等．原运进的蓝墨水有多少箱？
<gadget id="calculator">65 - 25</gadget>
<output>40</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">40 / (4/5)</gadget>
<output>50</output>

<result>50</result>