Question
The average of 10 numbers is 18. When two new numbers
'a' and 'b' are added, the average increases by 2. If a - b = 30, find the value of b.Solution
ATQ, Sum of 10 numbers = 10×18=180 Sum of 12 numbers = 12×20=240 So, a+b=240−180=60 ----------(i) And, a−b=30 -----------(ii) Solving (i) and (ii), we get: a+b=60 a−b=30 Adding these equations: 2a=90 a=45 Substituting a=45 into equation (i): 45+b=60 b=15
32, 41, 66, 115, 236, 415
- Find the wrong number in the given number series.
15, 23, 35, 51, 71, 85 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
...100, 164, 740, 3044, 9444, 20320
132, 192, 238, 266, 284, 292
Find the wrong number in the given number series.
2, 22, 58, 131, 276, 565
126, 295, 520, 807, 1170, 1611
334, 301, 271, 251, 239, 233
Find the wrong term in the given series below.
159, 160, 81, 244, 62, 318
Find the wrong number in the given number series.
26, 38, 70, 116, 178, 256
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