Question 263654
Some people got on a bus. 
At the first stop, one-third of the people got off 
and two-fifths of the original numbers got on. 
x-x/3+2x/5=y
 At the second stop, one-fourth of the people got off
y-y/4=z 

and two-thirds of the number that were left on the bus got on.
2z/3=a
 At the last stop, four-fifths of the people got off,
 leaving sixteen people on the bus. 
a-4a/5=16
How many people were on the bus before the bus reached the first stop?
x-x/3+2x/5=y and y-y/4=z and z+2z/3=a and a-4a/5=16
a = 80,   x = 60,   y = 64,   z = 48
check
60-20+24=64=y
64-16=48=z
48+32=80=a
80-64=16
ok
original 60 people on bus