For the fruit punch, Keira needed 2 gallons of grape juice. She already had 2 quarts of grape juice. Grape juice comes in bottles of 1 pint. How many bottles of grape juice does she need to buy?

Answer 1

You can use these conversions to help you: 4 qts is equivalent to 1 gallon and 2 pints is equivalent to 1 quart.

Also 8 pints is equivalent to 1 gallon.

Since she has 2 quarts already, she actually has 1/2 gallon (half of 4 quarts is a half gallon).

She now needs 1 and 1/2 gallons more.

For 1 and 1/2 gallons, she would need 8 pints plus 4 pints for a total of 12 bottles need to buy.

Answer 2

In a word problem with different units, I would first look at what units the answer requires then convert the information given.

Convert the information given into pints which is what the bottles are sold in:

1 gallon = 8 pints

1 quart = 2 pints

We need 2 gallons, we have an equation for 1 gallon, so:

2 x 1 (gallons) = 2 x 8 (pints) <-- (make sure whatever you multiply the left side by, you also multiply the right side!) 2 gallons = 16 pints

We have 2 quarts and our equation is for 1 so again:

2 x 1 (quarts) = 2 x 2 (pints)

2 quarts = 4 pints

Now that everything is converted we can look at what we need versus what we have.

We need 16 pints and already have 4 pints.

16 pints - 4 pints = 12 pints

1 pint = 1 bottle so we will need 12 bottles.