Mathematics
NULL
Medium
Question
A heap of stones can be made into groups of 21. When grouped by 16, 20, 25 or 45 there are 3 stones left each time. How many stones at least can there be in the heap?
A
7203
✓ Official correct answer
B
2403
C
3603
D
4803
Community credibility
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A
7203
No member explanations yet for this option.
B
2403
No member explanations yet for this option.
C
3603
No member explanations yet for this option.
D
4803
No member explanations yet for this option.
Explanation
n − 3 is a multiple of LCM(16,20,25,45) = 3600, and n is a multiple of 21. Least is 7203.