Members of the Rockham Soccer League buy socks and T-shirts. Socks cost 5 more than a pair of socks. Each member needs one pair of socks and a shirt for home games and another pair of socks and a shirt for away games. If the total cost is $2366, how many members are in the League?
- A)
- B)
- C)
- D)
- E)
Answer
B
Key insight
Each member's kit costs 2(4 + 9) = 26 dollars, so the head count is 2366 divided by 26.
Solution
A T-shirt costs dollars. One member needs two socks-and-shirt sets (home and away), so a member's kit costs
If there are members, then , so (check: ).
The answer is .
Why this works
The total cost is (cost per member) times (number of members). Building the per-member cost carefully, including every item listed, turns the word problem into one division. Read the quantity words ("another pair," "each") before writing anything.
The trap
Using one pair of socks and one shirt per member (13 dollars) and getting 182, choice (D).
Common mistakes
- Using one pair of socks and one shirt per member (13 dollars) and getting 182, choice (D).
- Taking the shirt to cost rather than more than socks, giving per member, which does not divide evenly.
Techniques
Set up the equation/formula and compute; no special trick needed