Question

Robert has a marble collection 1/7 of his marbles are blue 2/7 of his marbles are green. What fraction of Robert’s marbles are not blue or green?

Answer 1

4/7 of his marbles aren't blue or green.

Explanation:

1/7 + 2/7 = 3/7 marbles are either blue or green in total.

7/7 - 3/7 = you're left with 4/7 not blue or green marbles.