1.

What is value of x if average of 5x, 3y and 7x is 96 and y is 4 times of x.1). 122). 243). 984). 96

Answer»

We know the formula:

$({\rm{Average}} = {\rm{}}\FRAC{{{\rm{Sum\;of\;VALUES}}}}{{{\rm{NUMBER\;of\;values}}}})$

⇒ y = 4x

The given average

$(\Rightarrow {\rm{}}\frac{{5{\rm{x}} + 3{\rm{y}} + 7{\rm{x}}}}{3}{\rm{}} = {\rm{}}96)$

⇒ 5x + 3(4x) + 7x = 96 × 3

24X = 96 × 3

⇒ x = 288/24 = 12

∴ The value of x is 12.


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