Question 805049
m+w+k=500,
5m+3w+.01k=500
there are either 100, 200, 300 or 400 kids
so k=100
m+w+100=500,
5m+3w+1=500
k=100 doesn't work
or k=200
m+w+200=500,
5m+3w+2=500
k=200 doesn't work
so k=300
m+w+300=500,
5m+3w+3=500
k=300 doesn't work
or k=400
m+w+400=500,
5m+3w+4=500

m=98, w=2, k=400