Question

Lucy’s mom gave Lucy and her 3 friends an equal amount of juice from the 30 ounces she had left.

Answer 1

Lucy and 3 friends = 4 people

 30 ounces /  4 people = 7.5 ounces each

Answer 2

Well even if the answer are not shown it seems easy.

If lucy's mom gave her and her three friends the same amount of juice from 30 ounces that would mean it was dived up by 4.

30/4=7.5

so everyone got 7.5 ounces of juice.