Answer:
The cost of 1 meal, 1 night and 1 ski lesson is $ 160.
Step-by-step explanation:
Let the nights be N , meals be M, ski lesson is S.
According to the question
2 N + 3 M + S = 310.....(1)
2 N + 5 M + 2 S = 380 ..... (2)
N + 2 M = 150 .....(3)
By solving (1), (2) and (3) we get
N = $ 110, M = $ 20, S = $ 30
So, the cost of 1 night, 1 meal, 1ski lesson is
1 x 110 + 1 x 20 + 1 x 30
= 110 + 20 + 30
= $ 160