问题
单项选择题
There are 450 birds at a small zoo. The number of birds is 5 times the number of all the other animals combined. How many more birds are there than non-bird animals at the zoo ？（）
A. 400
B. 360
C. 270
D. 180
E. 90
答案
参考答案：B
解析：
If the 450 birds are 5 times the number of non-bird animals, then non-birds=450/5=90. 450-90=360 more birds than non-birds at the zoo.