How many positive factors do 180 and 90 have in common?
Choose the correct option.
A) 6
B) 12
C) 16
D) 18
E) 24
The number of common factors will be same as number of factors of the Highest Common Factor(HCF)   HCF of 180 and 90 is 90   Number of factors of 90 = 12   Answer :12
<result>B</result>
How many positive factors do 180 and 90 have in common?