Thirty people are waiting in line to buy pizza. There are 10 people in front of Andy. Susan is the last person in the line. How many people are between Andy and Susan?
A.
18
B.
19
C.
20
D.
21
Exam No：2018 First Round Grade 3 Year：2018 Question No：19
Answer:
A
Knowledge points:
G3 - Number Sense - Number Line
Solution:
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