Which of the following is the lowest positive integer that is divisible by the first 8 positive integer multiples of 5? Answers:  A) 2100  B) 4200  C) 6300  D) 8400  E) 10,500
The number must be divisible by 5, 2*5, 3*5, 2^2*5, 5^2, 2*3*5, 7*5, and 2^3*5.   The lowest such number is 2^3*3*5^2*7 = 4200.   The answer is 4200.
<result>B</result>
Which of the following is the lowest positive integer that is divisible by the first 8 positive integer multiples of 5?