A water tank has three water inlet pipes A, B, and C. If only pipes A and C are opened, the water tank is full when pipe A injects 30 tons of water; if only pipes B and C are opened, pipe B injects 40 tons of water. The water tank is full. It is known that the amount of water injected by pipe B per minute is 1.5 times that of pipe A. Question: How many tons of water can the tank hold when it is full?
一水箱有甲、乙、丙三根进水管，如果只打开甲、丙两管，甲管注入30吨水时，水箱已满；如果只打开乙、丙两管，乙管注入40吨水时，水箱才满，已知乙管每分钟注水量是甲管的1.5倍．请问：该水箱注满时可容纳多少吨水？
<gadget id="calculator">30 * 3</gadget>
<output>90</output>

<gadget id="calculator">40 + 90</gadget>
<output>130</output>

<result>130</result>