Analysis: 8 pencils for 3 storybooks. 15 How many storybooks are there? 3 = 5; How many 8 pencils are there? 8×5=40 pencils.
A: (40)
Similarly, if four sheep are replaced by 12 geese, then 1 sheep can be replaced by geese:12 ÷ 4 = 3; So 10 sheep can be replaced by geese: 3× 10=30 sheep.