A group of tourists went to Sentosa. The total fare is $240. If 10 more tourists join the tour each will pay $4 less. Find the original number of tourists in the group

Answer 1

If there are n tourists, the cost each is 240/n

240/n - 4 = 240/(n+10)
n=20

check:
240/20 = 12
240/30 = 8 = 12-4