The average (arithmetic mean) of 12 numbers is 12. If 8 is subtracted from each of 8 of the numbers and 4 is added to each of the remaining 4 numbers, what is the new average?
Responda
3
4
6
8
9
Questão 8
Questão
The average (arithmetic mean) of 8 numbers is 14. If the average of 3 of these numbers is 4, what is the average of the remaining 5 numbers?
Responda
17
18
20
23
26
Questão 9
Questão
The average (arithmetic mean) of a, b, 9, 10, and 11 is 10. If ab = 51 and b > a, then a =
Responda
3
5
7
8
11
Questão 10
Questão
If the sum of 5 distinct negative integers is -15, then the greatest of these integers is
Maria’s fruit punch is halt water and half punch. If adding 24 ounces of water changes the water-to-punch ratio to 7:5, how many ounces of punch are there?
Responda
5
10
24
36
60
Questão 15
Questão
Skiing down a 120-meter slope takes 20 seconds. If climbing back up is done at a rate of 180 meters per minute, what is the average speed, in meters per second, for the round-trip?
Responda
4
4.5
24
60
93
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