Answer: Yes, he should buy a membership pass. 
Explanation:
Hi, to answer this question we have to analyze the information given; 
If Marcel has $40 to spend and the tickets cost $1.50 without membership, we have to divide Marcel's money (40) by the price of each ticket ($1.50) to obtain the number of tickets that he can buy. 
Mathematically speaking: 
40 / 1.50 = 26.6=26 tickets 
With the membership the tickets costs $1.25 each, but the membership costs $5. So we have to divide $35 ($40 -$5) by $1.25. 
35 /1.25 = 28 tickets 
By comparing, he can buy more tickets with the membership pass. 
So, the answer is yes. He should buy a membership pass.