To eat to when she gets full, Michaela needs 20 oranges. Cassandra needs twice as many oranges as Michaela to eat until she gets full. If they picked 90 oranges from the farm today, how many oranges would remain after they've both eaten until they were full?
How many oranges does Cassandra need to eat? ** Since Michaela needs 20 oranges to eat to her full, and Cassandra eats twice as much to have her full, Cassandra needs 2*20 = <<20*2=40>>40 oranges to eat.
How many oranges do Michaela and Cassandra eat together? ** They eat 20+40 = <<20+40=60>>60 oranges together to have their fill.
How many oranges would remain after they've both eaten until they were full? ** If they picked 90 oranges today, after eating 60 together, 90-60 = <<90-60=30>>30 oranges would remain.
#### 30