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Q.

The average of some articles is 55 and their sum is 1100 find the number of articles

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a

100

b

120

c

20

d

80

answer is A.

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Detailed Solution

Aug = 55

Sum = 1100

No. of article = ?

$\frac{1100}{x} = 55$

$55 x = 1100$

$x = \frac{1100}{55} = 20$

No. of articles = 20

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