cleo collected a sack of seashells at the beach. she gave amy 2/5 of the seashells and used 1/4 of the remainder for a craft project. she placed the remaining 27 seashells in her aquarium. how many seashells did cleo collect at the beach?
2/5 + 1/4 * 3/5 = 11/20
so, now we know that of the x total shells,
9/20 x = 27
Now just find x