Short Answer 
The riddle indicates that two coins total 30 cents, with the condition that one isn’t a nickel. The correct combination is a quarter (25 cents) and a nickel (5 cents), which satisfies the given criteria.
Step 1: Understand the Riddle
The riddle states that two coins add up to 30 cents. It also mentions that one of these coins isn’t a nickel. This specific wording can be misleading, suggesting that if one coin is not a nickel, the other must be. However, careful consideration is needed to find the solution.
Step 2: Analyze the Coin Options
To solve the riddle, we must consider which coins can add up to 30 cents. The potential coin combinations are essential here. Focus on the following coins:
- Quarter (25 cents)
- Nickel (5 cents)
Step 3: Identify the Correct Combination
Now that we understand the coin options, we can determine the correct combination. Remember that the riddle states one of the coins isn’t a nickel, but it does not specify that both can’t be nickels. Thus, the solution to the riddle is a quarter (25 cents) and a nickel (5 cents), as this combination fits the criteria of totaling 30 cents while fulfilling the riddle’s rule.