I don't know what this question is help me pls

Question

Of all of the students in a class, 3/4 take the bus to school. 3 /16 of the students in the class walk to school. The remaining students are driven to school in a car. a) What fraction of the class is driven to school in a car? b) What fraction of the class does not walk to school? c) Is it possible that there is a total of 25 students in the class? Explain.

Answer 1

bus=3/4 walk=3/16

Total fraction for bus + walk =

=3/4+3/16

=12/16+3/16 (multiply the 3/4 fraction with 4 to get the same denominator)

=15/16

a) Fraction of class driven to school in car = 1 - 15/16 = 1/16

b) Fraction of class who doesn't walk to school = 3/4 + 1/16

= 12/16+1/16

=13/16

c) It is not possible for there to be 25 students in the class because 25 is not divisible by the denominator of the fraction which is 16