Mathematics, 03.05.2021 14:00 uaodiase
The average of 6 numbers is 15. The average decreases by 1 when the 7th
number is added. What is the value of the 7th number?
A. 7 C. 9
B. 8 D. 10
Answers: 3
Mathematics, 21.06.2019 13:00
Add 1/7 + -1/7 your answer should be reduced to its smallest form and should not be an improper fraction
Answers: 1
Mathematics, 21.06.2019 19:00
Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?
Answers: 3
The average of 6 numbers is 15. The average decreases by 1 when the 7th
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