For this case, they ask us to determine which of the improper fractions (Numerator is greater than or equal to the denominator) given is not equivalent to "3".
Option A:
[tex]\frac {21} {7} = 3[/tex]
Three times the number "7" gives "21".
Option B:
[tex]\frac {21} {9} = \frac {7} {3}[/tex]
Note that if we divide the numerator and denominator by "3" we get the fraction \ frac {7} {3} other than the integer "3".
Option C:
[tex]\frac {3} {1} = 3[/tex]
Option D:
[tex]\frac {27} {9} = 3[/tex]
Three times the number "9" gives "27"
Thus, the fraction that is not equivalent to "3" is: [tex]\frac {21} {9}[/tex]
Answer:
Option B
