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Prime Factorization Word Problems

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Q 1: What is the smallest number of students required so that they may be uniformly arranged in rows of 12, 16 or 20? (Hint: find the LCM of the numbers)
245
220
240

 Q 2: Three clocks ring once at the same time. After that, the first clock rings after every 3 hours, the second after every 4 hours, and third after every 5 hours. After how many hours will they again ring together?
60 hours
Never
70 hours

Q 3: Some boxes of chocolates are 20 dollars each, some ar 40 dollars and some are 60 dollars each. Find the least sum of money with which we can buy an exact number of chocolates of each kind?
120
160
100

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Question 5: This question is available to subscribers only!

 Question 6: This question is available to subscribers only!


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