Xiaoming’s water heater is full. One morning, Xiaoming’s mother used 20%, Xiaoming’s father used another 18 liters, and Xiaoming used up 10% of the remaining water. The remaining water was only half of the stored water and 3 liters less. , How many liters of water is stored in Xiaoming's electric water heater?
小明家电热水器贮满了，一天早晨，小明妈妈用去20%，小明的爸爸又用去18升，小明用去了剩下水的10%，最后剩下的水只有贮存数量的一半还少3升，小明家的电热水器贮水量是几升？
<gadget id="calculator">18 - 1.8 - 3</gadget>
<output>13.2</output>

<gadget id="calculator">0.8 - 0.08 - 0.5</gadget>
<output>0.22</output>

<gadget id="calculator">13.2 / 0.22</gadget>
<output>60</output>

<result>60</result>