SSC CGL 12 Aug 2017 Shift 1 Paper

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Question : 56 of 100

Marks: +1, -0

a, b

and

c

are 3 values, such that

a+b=5, b+c=7.5

and

c+a=8.5 .

What will be the average of these values?

1.5
3
3.5
4.5

Solution:

a+b=5

....(i)

b+c=7.5

...(ii)

c+a=8.5

....(iii)
(ii) and (iii), On adding Eqs. (i), we get

2(a+b+c)=5+7.5+8.5

⇒

a+b+c= {21}/{2}

⇒

{a+b+c}/{3}= {21}/{2 × 3}=\ {7}/{2}

∴

{a+b+c}/{3}=3.5

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