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12 May 2017, 05:10
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Difficulty:
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Question Stats:
86% (01:17) correct
14%
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based on 58
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Dexter found 288 shells in his first four visits to the beach and 405 shells in his next five visits. What is the average (arithmetic mean) number of shells he found per visit?
A. 81
B. 77
C. 72
D. 45
E. 32
A. 81
B. 77
C. 72
D. 45
E. 32
12 May 2017, 05:45
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288+405=693 shells in total
693/9 visits= 77 shells per visit
B
693/9 visits= 77 shells per visit
B
12 May 2017, 07:48
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Bunuel
Dexter found 288 shells in his first four visits to the beach and 405 shells in his next five visits. What is the average (arithmetic mean) number of shells he found per visit?
A. 81
B. 77
C. 72
D. 45
E. 32
A. 81
B. 77
C. 72
D. 45
E. 32
TOTAL # of shells collected = 288 + 405 = 693
TOTAL # of visits = 4 + 5 = 9
So, AVERAGE # of shells per visit = 693/9
ASIDE: We can avoid performing this calculation if we focus on the units digits
If AVERAGE # of shells per visit = 693/9, we can also say: (AVERAGE # of shells per visit)(9) = 693
So, among the answer choices, we're looking for one such: (the units digit)(9) = --3
Only one answer choice (77) works.
Since (7)(9) = 63, we know that the correct answer is 77
Answer:
