Question

15 friends went to a restaurant to celebrate new year. 10 of them spent 120 each on their
food and the rest spent 40 more than the average expenditure of all the 15. What was the
total money spent by them?​

Answer 1

Answer:

Provided above in the given attachments

Answer 2

The total money spent by them was Rs.1328.57.

Step-by-step explanation:

Given :

10 of 15friends spent 120 each on their food.

Rest 5 friends spent 40 more than the average expenditure of all the 15.

To Find:

The total money spent by them.

Formula Used:

The average expenditure = Total expenditure done by all friends /Number of  all friends

Solution:

Let the  money spent by rest 5 friends  is P.

As given - 10 of 15friends spent 120 each on their food.

            The money spent by 10 friends $= 10\times 120= 1200 \ Rs.$

Total money spent by all friends=  The money spent by 10 friends + the  money spent by rest 5 friends

                                                  $=1200 +P$

The average expenditure = Total expenditure done by all friends /Number of  all friends

                                          $=\frac{1200+P}{15}$

As given - Rest 5 friends spent 40 more than the average expenditure of all the 15.

 $P= (\frac{1200+P}{15} ) +40$

$15P= 1200+P+40\times 15$

$15P= 1200+P+600$

$14P = 1800$

    $P= 128.57$

The total money spent by them =    The money spent by 10 friends + the  money spent by rest 5 friends

                                                    $= 1200+ 128.57$

                                                    $= 1328.57$  Rs.

Thus, the total money spent by them is Rs. 1328.57.

Correct Question:

15 friends went to a restaurant to celebrate new year. 10 of them spent  Rs.120 each on their food and the rest spent 40 more than the average expenditure  of all the 15. What was the total money spent by them?