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  • Question
  • If the average height of boys in a hall is 180 cm and that of girls is 150 cm. If the average height of the gathering is 165 cm, then find the number of girls present in the hall if the number of boys present in the hall are 78 ?


  • Options
  • A. 56
  • B. 64
  • C. 87
  • D. 78

  • Correct Answer
  • 78 

    Explanation

    Using Trial and error method,

    we get the number of girls in the hall = 78

  • Tags: AIEEE, Bank Exams, CAT, GATE, Bank Clerk, Bank PO

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    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. A student was asked to find the arithmetic mean of the numbers 3, 11, 7, 9, 15, 13, 8, 19, 17, 21, 14 and x. He found the mean to be 12. What should be the number in place of x ?

    • Options
    • A. 6
    • B. 7
    • C. 8
    • D. 9
    • Discuss
    • 6. If the mean of a, b, c is M and ab + bc + ca = 0, then the mean of a2+b2+c23 is :

    • Options
    • A. M
    • B. 3 M^2
    • C. 2 (M/3)
    • D. M^2
    • Discuss
    • 7. 12 boys decided to constribute Rs. 750 each to an Orphange. Suddenly few of them boys dropped out and consequently the rest had to pay Rs. 150 more. Then the number of boys who dropped out?

    • Options
    • A. 4
    • B. 6
    • C. 2
    • D. 3
    • Discuss
    • 8. The average of six numbers is 3.95. The average of two of them is 3.4, while the average of the other two is 3.85. What is the average of the remaining two numbers ?

    • Options
    • A. 3.6
    • B. 4.6
    • C. 6.5
    • D. 7.3
    • Discuss
    • 9. In an NGO the daily average wages of 20 illiterate employees is decreased from Rs.25 to Rs.10, thus the average salary of all the literate and illiterate employees is decreased Rs.10 per day. The No. of educated employees working in the NGO is :

    • Options
    • A. 15
    • B. 20
    • C. 10
    • D. Data Insufficient
    • Discuss
    • 10. A man covers a journey from Meerut to Delhi by a car at an average speed of 40 km/hr. He returns back by scooter with an average speed 24 km/hr. Find his average speed during the whole journey?

    • Options
    • A. 32 kmph
    • B. 27 kmph
    • C. 30 kmph
    • D. 31 kmph
    • Discuss


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