Average of 5 quantities is 6 . average of three of them is 8 . average of remaining two quantities?

English

Gujarati

Hindi

4.Average

medium

The average of $5$ quantities is $6 .$ The average of three of them is $8 .$ What is the average of remaining two quantities?

A

$2$

B

$5$

C

$9$

D

$7$

Solution

Let the average of remaining two quantities is $y$.

According to the question

$\frac{3 \times 4+2 \times y}{5}=6 \Rightarrow 12+2 y=30 \Rightarrow y=9$

Hence the average of remaining two quantities is $9.$

Standard 13

Quantitative Aptitude

Share

Similar Questions

The average weight of $10$ students is increased by half a $kg$ when one of the students weighing $50\, kg$ is replaced by a new student. Find out the weight of the new student.(in $kg$)

easy

Of the three numbers, the average of the first and the second is greater than the average of the second and the third by $15 .$ What is the difference between the first and the third of the three numbers?

medium

The average of three numbers is $154 .$ The first number is twice the second and the second number is twice the third. The first number is

medium

The average of a non-zero number and its square is $5$ times the number. The number is

medium

The average monthly expenditure of a family for the first four months is $Rs.\, 2570$, for the next three months $Rs.\, 2490$ and for the last five months $Rs.\,3030.$ If the family saves $Rs.\, 5320$ during the whole $year,$ the average monthly income of the family during the year is (in $Rs.\,$)

hard