Answer: Dylan's water bottle holds 400 milliliters more water than Erin's water bottle.
Step-by-step explanation:
First, I am going to change all of the units to be the same. To do that, I am going to convert the measurement of Dylan's water into milliliters. I know that one liter is equivalent to 1000 milliliters, so I can safely say that Dylan's water bottle can hold 1000 milliliters or water. Now that the two measurements are in the same units, it is easy to see that Dylan's water bottle holds more water. But by how much?
All you have to do is subtract the amount of water that Erin's water bottle can hold from the amount of water that Dylan's water bottle can hold. 1000 - 600 = 400 milliliters.
So the number of ways of choosing two distinct letters at a time is (42)=6. We can then add the duplicate pairs which are O,O and N,N to give a total of 8 possible pairs.
