There are 18 biscuits. They are first shared equally among 3 friends. After that, each friend gives 1 biscuit to the next friend in a clockwise manner. How many biscuits does each friend have at the end?
Answer
6
The correct answer is 6 — So the number of biscuits each friend has at the end remains 6.
Step-by-step solution
- Divide 18 biscuits equally among 3 friends: 18 ÷ 3 = 6 each.
- Each friend gives 1 biscuit to the next friend: each loses 1 biscuit.
- At the same time, each friend receives 1 biscuit from the previous friend: each gains 1 biscuit.
- Net change for each friend = +1 – 1 = 0.
- So the number of biscuits each friend has at the end remains 6.
Common mistake: Not accounting for the biscuit received from another friend
Concept tested: Circular sharing
Published · How this solution was prepared and checked
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