The average age of a class of 40 boys is 11.95 years. The average of the class is raised to 12 years by the coming of a new boy. How old is this new boy?
Correct answer D. 14 years
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ECAT Math MCQs
Page 34 of ECAT Math multiple-choice questions with answers. Tap an option to check yourself.
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The average age of a class of 60 boys which is 11.9 years is raised to 12 years by coming of a new boy the age of the new boy is?
Correct answer C. 18 years
The average expenditure of a man for the first 7 months is Rs. 130 and for the next 5 months is Rs. 140. He withdraws a sum of Rs.110 from his bank. His average monthly earning is?
Correct answer A. Rs. 125
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The average weight of 20 students in a class is decreased by 500 grams when one of the students who weights 40 kg is replaced by a new boy. The weight of the new boy is?
Correct answer C. 30 kg
The average age of 6 men is increased by 3 years when two of them whose ages are 25 and 27 years are replaced by two men. The average age of two newcomers is?
Correct answer D. 35 years
There were 40 members in a certain hostel. If 10 members are more admitted the expenses of the mess was increased by Rs. 50 per month while the average expenditure per head diminished by Rs.3. The original monthly expenses are?
Correct answer B. Rs.800
The average income of a group of 3 men V W and X is 54 rupees. An other man Y joins their group and the average now becomes 50 rupees. If another men Z Whose income is 5 more than Y replaces V and average of W X Y and Z becomes 49. What is the income of V?
Correct answer A. 47
Average cost of 100 eggs is 2 rupees. It is lowered to 1.5 on buying an additional 100 eggs. What is the difference of cost of additional 100 eggs and previously purchased 100 eggs?
Correct answer C. Rs. 150
In a survey the average age was found to be 40 years. After correction the age of 100 people is increased from 35 to 50 years each. The new average is 50 years. The total number of people surveyed are?
Correct answer C. 150
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The average salary of employees in a factory is Rs. 2200. All employees are divided in two grades A and B having an average of Rs. 2450 and Rs. 1950 respectively. If grade A has 10 employees then how many employees have grade B?
Correct answer E. none
A team won 5 matches with the average margin of 32 runs. In next two matches they are defeated by an average of 10 runs. The average margin for all the matches will be?
Correct answer A. 20
The average temperature for first 4 days i.e. Monday Thursday is 37.5C?. While for the last 4 days i.e. Thursday to Sunday is 30C?. If the temperature on Thursday is 30?C then the average for the whole week will be?
Correct answer A. 34.3
The average earning of a firm for first 6 months is Rs. 2100 per month. While for the last two quarters is Rs. 6300 per puarter. The net average income per month will be?
Correct answer D. 2100
The average of goals scored for a match before final is 5. After the final this average is decreased by 0.2. If 10 matches are played throughout the tournament then the goals scored in final are?
Correct answer B. 3
The average temperature of a week is 33C?. Average of first three days is 30?C while of the last three is 35?C. What is the temperatureof the fourth day?
Correct answer C. 36
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The average attendance per week of a class of 21 during a week is 5. If the average attendance per week of 20 of them during the week is 5.1 then the attendance of the last one during the week will be?
Correct answer C. 3
A man spent 1/3 of his salary in three weeks with the average of Rs. 250 for first two weeks and Rs.200 in third week. His salary will be?
Correct answer C. 2100
The number of deths in increased by 24 in a hospital during this year. If there are 2A deaths in last 2 years then the average for the three years will be?
Correct answer E. (2A+24)/3
A motorcyclist has covered 10 miles in half hour 36 miles in one hour and 50 miles in 2 hours and 30 minutes. Find the average distance covered in one hour?
Correct answer E. none
A shopkeeper bought 5 dozens of eggs in 50 rupees 84 eggs in 70 rupees and 3 dozen in 30 rupees the average rate of one dozen will be?
Correct answer A. 10