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Home Aptitude Ratio and Proportion Comments

  • Question
  • The average age of students of a class is 15.8 years. The average age of boys in the class is 16.4 years and that of the girls is 15.4 years. The ratio of the number of boys to the number of girls in the class is:-


  • Options
  • A. 1:2
  • B. 2:3
  • C. 3:4
  • D. 3:5

  • Correct Answer
  • 2:3 

    Explanation

    Let the ratio be x : y
    Total boys = 16.4 X x
    Total girls = 15.4 X y
    Total number of students in class = 16.4x + 15.4y
    The average age of all students is 15.8
    The total age of boys is 15.8x
    The total age of girls is 15.8y
    16.4x + 15.4y = 15.8x + 15.8y
    0.6 x = 0.4 y
    x/y = 0.4/0.6 = 2/3


  • Ratio and Proportion problems


    Search Results


    • 1. A certain factory employed 600 men and 400 women and the average wager was Rs. 25.50 per day, If a woman got Rs. 5 less than a man, then what are their daily wages ?

    • Options
    • A. m:25.50 w:27.50
    • B. m:27.50 w:22.50
    • C. m:26.50 w:27.50
    • D. m: 24.50 w:26.50
    • Discuss
    • 2. A team of 8 persons joins in a shooting competition. The best marksman scored 85 points. If he had scored 92 points, the average score for the team would have been 84. The number of points, the team scored was :

    • Options
    • A. 665
    • B. 657
    • C. 658
    • D. 678
    • Discuss
    • 3. The average salary of all the workers in a workshop is Rs. 8000. The average salary of 7 technicians is Rs. 12000 and the average salary of the rest is Rs. 6000. The total number of workers in the workshop is :

    • Options
    • A. 20
    • B. 21
    • C. 23
    • D. 24
    • Discuss
    • 4. The average monthly salary of the employees of a firm is Rs.60 out of the employees 12 officers get an average of Rs.400 per month and the rest an average of Rs. 56 per month , Find the number of emp

    • Options
    • A. 1030
    • B. 1032
    • C. 1062
    • D. 1060
    • Discuss
    • 5. The average temperature of the town in the first four days of a month was 58 degrees. The average for the second, third, fourth and fifth days was 60 degrees. If the temperatures of the first and fifth days were in the ratio 7 : 8, then what is the temperature on the fifth day ?

    • Options
    • A. 62 degrees
    • B. 64 degrees
    • C. 65 degrees
    • D. 66 degrees
    • Discuss
    • 6. The average temperature for Monday, Tuesday, Wednesday and Thursday was 48° . The average temperature for Tuesday, Wednesday, Thursday and Friday was 52°, If the temperature on Monday was 42°, then the temperature on Friday was (in degrees)

    • Options
    • A. 58
    • B. 56
    • C. 52
    • D. 50
    • Discuss
    • 7. A library has an average of 510 visitors on Sundays and 240 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is :

    • Options
    • A. 285
    • B. 290
    • C. 297
    • D. 305
    • Discuss
    • 8. The average weight of 45 passengers in a bus is 52 kg. 5 of them whose average weight is 48 kg leave the bus and other 5 passengers whose average weight is 54 kg join the bus at the same stop. What is the new average weight of the bus?

    • Options
    • A. 54.21 kgs
    • B. 51.07 kgs
    • C. 52.66 kgs
    • D. 53.45 kgs
    • Discuss
    • 9. A car owner buys petrol at Rs 7.50, Rs. 8 and Rs. 8.50 per litre for three successive years. What approximately is the average cost per litre of petrol if he spends Rs. 4000 each year ?

    • Options
    • A. 6.23
    • B. 7.98
    • C. 8.97
    • D. 9.89
    • Discuss
    • 10. 19 friends went to a restaurant for a combined weekend dinner party. 13 of them spent Rs. 79 each on their dinner and the rest spent Rs. 4 more than the average expenditure of all the 19. What was the total money spent by them?

    • Options
    • A. Rs. 1398.96
    • B. Rs. 1457.09
    • C. Rs. 1662.35
    • D. Rs. 1536.07
    • Discuss


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