The greatest number of five digits which is divisible by 32, 36, 40, 42 and 48 is_________?
Correct answer: D. 90720
- A. 90730
- B. 90725
- C. 90715
- D. 90720
Explanation
The LCM of 32, 36, 40, 42 and 48 is 2^5 x 3^2 x 5 x 7 = 10080. The greatest five-digit multiple is 10080 x 9 = 90720, because 10080 x 10 = 100800 has six digits. The likely wrong choice is 90730, which is close but not divisible by the required numbers.
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