the average of first four number is three times the fifth number if the average of all five number is 85.8 then the fifth number is
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Fifth number = \displaystyle xx
Given average of first four = \displaystyle 3x3x
\displaystyle \therefore∴ sum of first four = \displaystyle 4 \times 3x = 12x4×3x=12x
\displaystyle \therefore∴ sum of all five \displaystyle = 12x + x = 13x=12x+x=13x
Average of all five given \displaystyle 85.885.8
\displaystyle \therefore \frac{13x}{5} = 85.8∴
5
13x
=85.8
\displaystyle \implies x = 33\:\underline{Ans}⟹x=33
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