A bag holds 100 fluid ounces of water. Evan drains 1 1/2 quarts of water from the bag. Then, Matthew drains another 3 pints of water from the bag. How many fluid ounces of water remain in the bag?

There are 4 cups in 1 quart, so 1 1/2 quarts is equal to 6 cups.

There are 2 pints in 1 quart, so 3 pints is equal to 1 1/2 quarts or 6 cups.

Therefore, Evan drained 6 cups or 48 fluid ounces of water from the bag.
Matthew drained 6 cups or 48 fluid ounces of water from the bag.

The total amount of water drained from the bag is 96 fluid ounces.

The amount of water remaining in the bag is 100 fluid ounces - 96 fluid ounces = 4 fluid ounces.

Therefore, 4 fluid ounces of water remain in the bag.

To solve this problem, we need to convert the quarts and pints to fluid ounces.

1 quart is equal to 32 fluid ounces.
1 pint is equal to 16 fluid ounces.

Evan drains 1 1/2 quarts of water:
1 1/2 quarts = 1.5 quarts
1.5 quarts = 1.5 * 32 fluid ounces
1.5 quarts = 48 fluid ounces

Matthew drains 3 pints of water:
3 pints = 3 * 16 fluid ounces
3 pints = 48 fluid ounces

Now, we can calculate the total amount of water drained from the bag:
Total drained = 48 + 48 = 96 fluid ounces

To find the amount of water remaining in the bag, we subtract the total drained from the initial amount of water in the bag:
Remaining water = Initial amount - Total drained
Remaining water = 100 - 96
Remaining water = 4 fluid ounces

Therefore, there are 4 fluid ounces of water remaining in the bag.