out of 32, 5 ride to school
so assuming that the ratio of (total students) to (bike riders) is the same then
32 is to 5=800 is to x
convert to reatios
32:5=800:x
make as fractions
32/5=800/x
multiply both sides by x
32x/5=800
multipl y both sides by 5
32x=4000
divide both sides by 32
x=125
125 ride bike s to school