Answer:
15
Step-by-step explanation:
Total students = 60
Number of student who gave speech yesterday = 2/3 of 60
[tex]=\frac{2}{3}*60=2*20[/tex] = 40
Remaining students = 60 - 40 = 20
Number of students who gave speech today = 1/4 of 20
[tex]=\frac{1}{4}*20=1*5=5[/tex]
Number of students who still haven't give speech = 20 - 5 = 15