Answer:
15
Explanation:
70% of the total strength of class = 35
therefore 100% of the strength of class ( total student in grade 5) = 35/70*100 = 50.
So out of 50 students 35 students want the basket ball court in the school to be renovated. This means there are 50-35 = 15 students who do not want the basket ball court in the school to be renovated