The customer who will be the first to receive a free rose and a free lily is 18th customer
Given:
Every 6th customer = free rose
Every 9th customer = free Lily
Which customer will be the first to receive a free rose and a free lily?
find the lowest common multiple of 6th and 9th customer
6th customer = 6, 12, 18, 24, 30, 36, 42, 48, 54, 60
9th customer = 9, 18, 27, 36, 45, 54, 63
The lowest common multiple of 6th and 9th customer is 18
Therefore, the customer who will be the first to receive a free rose and a free lily is 18th customer
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