Calculus
posted by Phyl .
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

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 = 124