Kimberly went hiking and took a 4-liter bottle full of water with her. The first time she drank from it, she consumed a quarter of the water in the bottle. Later on, she drank 2/3rd of the remaining water. How much water is left in the bottle (in liters)?
Her first drink consumed 1/4 * 4 = 
<gadget id="calculator">1/4*4</gadget>
<output>1</output>
1 liter of water.
Thus there were 4 - 1 = 
<gadget id="calculator">4-1</gadget>
<output>3</output>
3 liters of water left in the bottle.
Next, she drank 2/3 * 3 = 
<gadget id="calculator">2/3*3</gadget>
<output>2</output>
2 liters.
Thus, there were 3 - 2 = 
<gadget id="calculator">3-2</gadget>
<output>1</output>
1 liters remaining.

<result>1</result>