Question

QUANTITATIVE APTITUDE
51. किसी परीक्षा में 8 विद्यार्थियों द्वारा प्राप्त
अंकों का औसत 51 है तथा अन्य 9
विद्यार्थियों के औसत अंक 68 है। पूरे 17
विद्यार्थियों द्वारा प्राप्त अंकों का औसत है।
(1) 59
(2) 59.5
(3)60
(4) 60.5​

Answer 1

Answer:

3333333

Step-by-step explanation:

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Answer 2

Answer: 60

In short,

[ 51 x 8 + 68 x 9 ] / [8+9] == [3 x 8 = 4 x 9 ] == 60

Step-by-step explanation:

Given,

Average marks of 8 students = 51

Average marks of another 9 students = 68

To find,

Average of the 17 students [8+9]

We know,

Average = Sum/Number

So, SUM = Average x Number

Now, sum of marks of 8 students = 51 x 8

sum of marks of 9 students = 68 x 9

Average of 17 students = sum of marks of 17 students/17

                                        = { [51 x 8] + [68 x 9] } /17

                  == 17 x { [3 x 8] + [4 x 9] }/17 == 24+36 == 60

{ 51 & 68 are multiples of '17',so '17' as a common factor was taken out in the numerator part }