For number 3, we have to divide 4 hours by 2 days, so we get
[tex]\frac{4}{2}=2[/tex]
so it is 2 hours per day
if there are 392 students, and 184 are boys. there are 208 girls. So the ratio is
[tex]\frac{184}{208}=\frac{23}{26}[/tex]
and for number 5 we get that
[tex]\frac{420}{660}=\frac{7}{11}[/tex]
