Nine friends have a dinner in a hotel. Eight of them spent Rs., 12 each on their meals and ninth spe

English

Gujarati

Hindi

4.Average

medium

Nine friends have a dinner in a hotel. Eight of them spent $Rs.\, 12$ each on their meals and the ninth spent $Rs. \,16$ more than the average expenditure of all the nine. Find out the total money in $Rs.$ spent by them?

A

$126$

B

$135$

C

$111$

D

$141$

Solution

Let average expenditure of $9$ person $=x$

According to the question

$12 \times 8+(x+16)=9 x \Rightarrow 8 x=112 \Rightarrow x=\frac{112}{8}=14$

Total money spent $=9 x=9 \times 14=126$ Rs.

Standard 13

Quantitative Aptitude

Share

Similar Questions

The $average$ of $30$ numbers is $12 .$ The $average$ of the first $20$ of them is $11$ and that of the next $9$ is $10 .$ The last number is

medium

Roshan bought $5$ pants at $Rs.\, 25$ each, $10$ shirts at $Rs.\, 50$ each and $15$ ties at $Rs.\, 35$ each. Find the average price of all the articles in $Rs.$

medium

The average of six numbers is $32 .$ If each of the first three numbers is increased by $2$ and each of the remaining three numbers is decreased by $4,$ then the new average is ?

medium

The average temperature of Monday, Tuesday, Wednesday and Thursday is $60^{\circ}$. The average temperature for Tuesday, Wednesday, Thursday and Friday is $63^{\circ}$. If the ratio of temperature for Monday and Friday is $21: 25,$ then what is the temperature of Friday? (in $^{\circ}$)

medium

The mean of $19$ observations is $4 .$ If one more observation of $24$ is added to the data, the new mean will be

easy