kylin mixed two liquids for a science experiment. One container held 7/8 cup and the other held 9/10 cup. What is the total amount of mixture?

1 31/40 cups

Step-by-step explanation:

Combine the fractions 7/8 c and 9/10 c:

Use the LCD 40, which is divisible by both 8 and 10.

Then we end up adding 35/40 c to 36/40 c, which yields 71/40 c.

You may either leave this result as is, or write the improper fraction 71/40 as a mixed number: 1 31/40 c.