Write and equation that relates two sizes of coffee

Question

A coffee shop sells small cups of coffee for $0.95 each, medium for $1.25 each, and large for $1.55 each. Let S, M, and L be the number of small, medium, and large cups sold. They sold three times the number of small cups as large cups. Write an equation that relates S and L.

Answer 1

The language is a little confusing.

I think it is 3L = S