Answer: 52$
Explanation:
The money Dave spent on a t-shirt is obtained multiplying 120$ by the fraction 2/5
120(2/5) = 48$
And the money he spent on mountain bike magazines is obtained multiplying 120$ by the fraction 1/6
120(1/6)= 20$
The money he has left is:
120$ - 48$ -20$ = 52$