Question 373121
John wants to fence a 150 square meters rectangular field. He wants the length and width to be natural numbers {1,2,3,...}. What field dimensions will require the least amount of fencing? 
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You could create a "table":
width	length	area	perimeter
1	150	150	302
2	75	150	154
3	50	150	106
5	30	150	70
6	25	150	62
10	15	150	50
15	10	150	50
25	6	150	62
30	5	150	70
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From the above, we see that the answer is a field that is:
10 feet by 15 feet