water tank is filled with water through three pipes A, B, and C. If only pipes A and C are opened, the water tank will be full when pipe A injects 18 tons of water; if only pipes B and C are opened, the water tank will be full when pipe B injects 27 tons of water. It is also known that the amount of water injected by pipe B per minute is twice the amount of water injected by pipe A per minute. How many tons of water can the tank hold at most?
一个水箱，用甲、乙、丙三个水管往里注水．若只开甲、丙两管，甲管注入18吨水时，水箱已满；若只开乙、丙两管，乙管注入27吨水时，水箱才满．又知，乙管每分钟注水量是甲管每分钟注水量的2倍．则该水箱最多可容纳多少吨水？
<gadget id="calculator">27 + 27</gadget>
<output>54</output>

<result>54</result>