Mike observed that 75% of the students of a school liked skating if 35 of the students of the school did not like skating the numbers of students who like skating was

75% liked skating...so 25% did not
35 did not like skatingso 25% of total students is 35...
0.25x = 35
x = 35/0.25
x = 140so there are 140 students in total

75% of 140 like skating
0.75(140) = 105 students like skating <==