Question 282341
let the people in the group be x

cost / person = 200000/x

increase by 5

x+5

200000/x+5 

200000 /x -2000 = 200000/x+5

200000 -2000x /x  = 200000 / x+5

200000x -10000x +1000000 = 200000x

-10000x=-1000000
  Number of people now
x=100