‘Idli Vada’ is said for multiples of both 3 and 5 (LCM = 15). The 10th such multiple is 15 × 10 = 150. Thus, Idli Vada is said at 150.
Class 6 Mathematics Chapter 5 Prime Time question answer
Class 6 NCERT Ganita Prakash Chapter 5 Prime Time
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In the Idli Vada game, the phrase is used for numbers that are multiples of both 3 and 5, i.e., the least common multiple (LCM = 15). The multiples are 15, 30, 45, 60, 75, 90, 105, 120, 135, and 150. Counting to the 10th such multiple, we find 15×10 = 150. Therefore, the 10th instance of Idli Vada occurs at 150.
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