A fitness class can be organized into 10 groups with an equal number of participants in each group or into 15 groups with an equal number of participants in each group. What is the smallest possible number of participants in the class?
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Correcto\n
finally understood this
thanks
Wait, why isn't it 150? I keep mixing up LCM and just multiplying the two numbers together lol
because 30 already works for both (3 groups of 10, 2 groups of 15). smallest means we don't want the bigger multiple
ahh got it, thanks. multiplying gives a common multiple but not the smallest one
Is this really sub-505? felt like a warmup. got it in like 20 seconds
What it tests
Your understanding of divisibility rules, least common multiples, and greatest common factors.
Common trap
Forgetting that 1 is not prime and that every integer divides 0.