Rick has Math lessons every third day and French lessons every seventh day. If he has a Math lesson and a French lesson today, then what is the minimum number of days after which he will have both the lessons at the same day?
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Step-by-step explanation:
The only common one in both the numbers is 21, which means, the minimum number of days it will take for both the lessons to be on the same day, will be 21 days!
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