A group of friends decides to split the cost of a gift. If each friend contributes $15, they are $10 short of the total cost. If each friend contributes $16, they have $2 left over after covering the cost. How many friends are in the group?
✓ Correct Answer: Option B
Let 'n' be the number of friends and 'C' be the cost. 15n = C - 10 and 16n = C + 2. Subtracting the first from the second gives n = 12.