As he rides, Sir Reginald von Prime is going to plant a flag every time the total distance he has ridden is a prime number of km . How far will he have gone when he plants his 10th flag?
A.
23 km
B.
27 km
C.
29 km
D.
31 km
Exam No：2021 First Round Grade 5 Year：2021 Question No：7
Answer:
C
Knowledge points:
G5 - Number Theory - Prime Factorization (Factor Trees)
Solution:
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