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20 persons went to a hotel for a combined dinner party. 15 of them  spent 90 each on their dinner and rest spent 30 more than the average expenditure of all the 20. What was  the total money spent  ( in  ) by them?

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Important Questions on Average

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There were 30 students in a hostel. Due the admission of 20  new students, the expenses of the mess increases by 1600  per day while the average expenditure per head diminished by 8. What was the original expenditure (in ) of the mess?
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The average price of 3 precious diamond studded platinum thrones is ₹97610498312. If their prices are in the ratio 4:7:9. The price of the cheapest is

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The average weight of 23 boxes is 3 kg. If the weight of the container (in which the boxes are kept)is included, the calculated average weight per box increase by 1kg . What is the weight of container. 

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A man covers 1/4th of his journey by cycle in 40km/h, the 1/2 of the remaining by car at 20km/h, and the rest by walking at 10km/h. Find his average speed during the whole journey.

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The average age of a group of 15 persons is 25years and 5 months. Two persons, each 40 years old, left the group. What will be the average age of the remaining persons in the group?

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The  average  salary of the entire staff in an department  is Rs. 2000 per month . The average salary of officers is Rs. 3000 and that of non-officers is Rs. 1500. If the number of officers is 10, then find the number of non-officers in the office?

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The average of 'n' numbers is z. If the number x is replaced by the number  x1, then the average becomes z1. Find the relation between n, z, z1, x and x1.