Study Quest 04

The average of the first 71 natural numbers is :

• 35.5
• 36
• 71
• 72

The average age of a family of five members, four years ago, was 39 years. A child was born in the family and the average age of all the six members of the family today is 36 years. What is the present age

of the child?

• 4 years
• 2 years
• 3 years
• 1 year

By Selling an article for 360/- a man lost 10% . To gain 15% at what price it should be sold?

• 450/-

• 460/-

• 390/-
• 410/-

In an examination the average marks was found to be 60. The marks of 80 candidates had to be changed from 95 to 70 each and the average came down to 55 marks. The total number of candidates attended the examination were

• 100
• 250

• 300

• 400

A person buys a pen from a wholesaler at Rs. 10 for 20 pens. He sells those pens at Rs. 10 for 15 pens. Find his profit or loss percent. 

• 33.3% profit

• 25.5% loss

• 50% profit
• 20.4% loss

The average marks of a student obtained in Physics, Chemistry and Biology is 70. If the student obtained 90 marks in Mathematics, then the new average is

• 80
• 78
• 76
• 75

A Man bought 2 articles for same prize . He sold one article at 16% profit and other at 12% loss . find the net profit/loss ?

• 2% loss
• 2% profit
• 4% profit
• No profit, no loss

The average of 13 results is 50. If the average of first 7 results is 52 and that of last 7 results is 49, find the 7th result.

(a) 50

(b) 52

(c) 56

(d) 57

• 50
• 52
• 56
• 57

The average of five numbers is 27. If one number is excluded, the average becomes 25.

The excluded number is

• 35
• 30
• 40
• 45

A Trader sold a TV for 27,500 and gained 10% . find CP of TV ?

• 25000
• 27500
• 30000
• 32500