an apple tree had 20 apples two fifths of them were ripe how many were not ripe

Question

 an apple tree had 20 apples only two fifths of them were ripe . how many were not ripe

Answer 1

Not = 1 - Probability of "success", so if 2/5 are ripe, then 3/5 are not ripe...therefore, 20 x 3/5 = 20/5 x 3 = 4 x 3 = 12 apples are not ripe...no calculator required if the student can place 20/5 and know the answer, then multiply by 3...