a2 is divisible by both 40 and 75 if a has exactly three distinct prime factors, which of the following could be the value of 'a'? 

A

30 

B

60 

C

200 

D

420

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Updated: 17 hours ago

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A cement mixture is composed of 3 elements. By weight, ⅓ of the mixture is sand, 3/5 is water and the remaining 12 pounds of the mixture is gravel. What is the weight of the entire mixture in pounds? 

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A

60 

B

80 

C

90 

D

180 

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টাকা ৩টি করে লেবু কিনে টাকায় ২টি করে বিক্রয় করলে শতকরা কত লাভ হবে?

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৪০%

B

৫০%

C

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D

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 The sum of the ages of a father and his son is 45 years. Five years ago, the product of their ages was 4 times the father's age at that time. What are the present ages of the father and son?

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A

10, 40

B

12, 45

C

9, 36

D

18, 64

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