I am also having trouble figuring out the below:

Question

Eva wants to make two pieces of pottery. She needs 3/5 pound of clay one piece and 7/10 pound of clay for the other piece. She has three bags of clay that weigh 4/5 pound each. How many bags of clay will Eva need to make both pieces of pottery? How many pounds of clay will she have left over?

Answer 1

Convert to decimals to clarify.

.6 + .7 = 1.3 lbs

1.3/.8 = ?