Question

Myong is collecting rainwater for the garden in the first week she collected 5 gallons in the second week she collected 12 quarts in the third week she collected 7 pints how many cups of water does Myong have

Answer 1

1 gallon = 16 cups
1 quart = 4 cups
1 pint = 2 cups
Therefore...

Multiply
5 gallons × 16 cups = 80 cups
12 quarts × 4 cups = 48 cups
7 pints × 2 cups = 14 cups

Then...

Addition
80 cups + 48 cups + 14 cups = 142 cups

Answer
Myong has 142 cups of rainwater after 3 weeks of collecting rainwater.