The game says ‘idli-vada’ for common multiples of 3 and 5. These are: 15, 30, 45, 60, 75, 90, 105, 120, 135, and 150. Thus, the 10th instance is at 150.
Class 6 Mathematics Ganita Prakash Prime Time
Class 6 Mathematics Chapter 5 Prime Time question answer
In the idli-vada game, players say ‘idli-vada’ for numbers that are multiples of both 3 and 5. These numbers include 15, 30, 45, 60, 75, 90, 105, 120, 135, and 150. Therefore, when counting the 10th such occurrence, the number is 150. This pattern arises from the least common multiple (LCM) of 3 and 5, which is 15, repeating every cycle.
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