Question
There are 15 numbers such that average of first 12
numbers is 60 while the average of last five numbers is 75. Find the 12th number, if the ratio between 11th and 12th number is 11:4, respectively.Solution
Sum of first 12 numbers = (12 X 60) = 720 Sum of last 5 numbers = (75 X 5) = 375 Sum of 11th and 12th number = (720 - 375) = 345 So, 12th number = 345 X (4/15) = 92
- Find the wrong number in the given number series.
12, 20, 31, 45, 62, 84 81, 154, 124, 197, 167, 235
In each of the following giving number series, a wrong number is given. Find out the wrong number?
46 23 23 34.5 70 172.5
...- Find the wrong number in the given number series.
10, 19, 3, 28, 5, 54 14Â Â Â Â 15Â Â Â Â Â 24Â Â Â Â Â Â 50Â Â Â Â Â Â 98Â Â Â Â Â 179
...Find the wrong number in the given number series.
2, 3, 5, 8, 13, 22, 34Find the wrong number in the given number series.
- 71, - 7, 43, 78, 103, 119
66, 115, 34, 155, 14, 211
11, 12, 20, 58, 234, 1168
Find the wrong number in the given number series.
21, 42, 84, 116, 132, 264