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Q441

The average weight of a certain number of students in a class is 68.5 kg. If 4 new students having weights 72.2 kg, 70.8 kg, 70.3 kg and 66.7 kg join the class, then the average weight of all the students increases by 300 g. The number of students in the class, initially, is:

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Q442

Average age of 20 student is 21 years. 2 students leave the group and 1 new student joins the group. The average now becomes 20 years. If age of one of the student who left the group is 26 years and the one who joined is 20 years, then what is the age (in years) of other student who left the group?

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Q443

The average of n number is 45. If 60% of the number are increased by 5 each and the remaining numbers are decreased by 10 each, then what is the average of the number so obtained?

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Q444

Rita buys 5 sarees at an average cost of Rs. 2250. If she buys three more at an average cost of Rs. 2750, what will be the average (in Rs.) of all the sarees she buys?

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Q445

The average of three consecutive odd numbers is 52 more than

\frac{1}{3}^{rd}

of the largest of these numbers. What is the smallest of these numbers?

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Q446

The average of twelve numbers is 39. The average of the last five numbers is 35, and that of the first four numbers is 40. The fifth number is 6 less than the sixth number and 5 more than the seventh number. The average of the sixth and seventh numbers is:

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Q447

Find the average of the first 20 multiples of 9.

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Q448

Average temperature of a week is 30°C. If the average of first 4 days was 31°C, then average temperature of the remaining days will be:

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Q449

The average weight of a certain number of students in a group is 72 kg. If 10 students having an average weight of 78 kg leave and 4 students having an average weight of 80 kg join the group, the average weight of the students in the group decreases by 0.7 kg. The number of students initially in the group is:

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Q450

The average of prime numbers between 1 and 20 is-

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Q451

The average age of a family of 10 members is 20 years. If the age of the youngest member of the family is 10 years, then the average age of the members of the family just before the birth of the youngest member was approximately.

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Q452

The average of thirteen numbers is 47. The average of the first three numbers is 39 and that of next seven numbers is 49. The 11^th number is two times the 12^th number and 12^th number is 3 less than the 13^th number. What is the average of 11^th and 13^th numbers?

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Q453

The average of 7 consecutive odd number is A. If next 4 and previous 3 odd numbers to these 7 odd numbers are also included, then what is the new average of these 14 consecutive odd numbers?

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Q454

The average of sixteen numbers is 48. The average of the first six of these numbers is 45 and that of the last seven numbers is 53. The seventh and the eighth numbers are, respectively, 3 and 7 greater than the ninth number. What is the average of the ninth and seventh numbers?

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Q455

What is the average of all numbers between 8 and 74 which are divisible by 7?

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Q456

Three numbers are such that if the average of any two of them is added to the third number, the sums obtained are 164, 158 and 132 respectively. What is the average of the original three numbers?

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Q457

A man spends his three months income in four month time. If his monthly income is Rs. 1,000 then his annual savings is.

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Q458

A factory buys 7 machines. 2 machine A, 2 Machine B and rest Machine C. Prices of the machines are Rs. 95000, Rs. 75000 and Rs. 43000 respectively. Calculate the average cost of these machines-

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Q459

Average age of 7 students of a class is 28 years. Average age of first three students is 30 years. Age of fourth student is 4 years less than the age of fifth student. Ages of last two students is same and is 5 more than the average age of first three students. What is the average age of fourth and fifth student?

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Q460

Ras Bihari, a plumber, earned on an average Rs. 925 per day in the month of January. He earned on an average Rs. 881 per day during the first 20 days and Rs. 915 per day during the last 20 days. What was his average income (in Rs.) per day from 12^th January to 20^th January?

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