Exercise 1

Out of 9 persons, 8 persons spent Rs 30 each for their meals. The ninth one spent Rs 20 more than the average expenditure of all the nine. The total money spent by all of them was

There were 35 students in a hostel. If the number of the students is increased by 7, then the expenses of the mess increase by Rs 42 per day, while the average expenditure per head diminishes by Rs1. The original expenditure of the mess per day was

The average price of three items of furniture is Rs 15000. If their prices are in the ratio 3: 5: 7, the price of the cheapest item is

Of the four numbers, the first is twice the second, the second is one-third of the third and the third is 5 times the fourth. The average of the numbers is 24.75 the largest of these numbers is

Out of three numbers, the first is twice the second and is half of the third. If the average of the three numbers is 56, then difference of first and third number is

Of the three numbers, the first is twice the second and the second is twice the third. The average of the reciprocal of the numbers is. The numbers are

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?

The average of 50 numbers is 38. If the numbers 45 and 55 are discarded, then the average of the remaining number is

The mean of 5 numbers is 18. One number is excluded, their mean is 16. Find the excluded number

The average of 6 observations is 45.5 if one new observation is added to the previsions observations, then the new average become 47. The new observation is