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Prime Factorization Word Problems

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Q 1: Jane purchased some oranges to distribute to her friends. If she gave 4 or 5 or 6 oranges to each of her friends she will be left with 7 oranges. What is the least number of oranges she purchased?
60
67
Incorrect question

Q 2: Find the smallest number that is divisible by all even numbers between 5 and 15.
840
850
680

Q 3: 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 4: Some dolls are $30 each, some are $120 and some are $40 each. Find the least sum of money with which we can buy an exact number of dolls of each kind?
120
180
1200

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