Average


  1. The mean temperature of Monday to Wednesday was 37°C and of Tuesday to Thursday was 34°C. If the temperature on Thursday was 4/5 that of Monday, the temperature of Thursday was









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    Temperature of (Mon + Tue + Wed) = 37 x 3 = 11°C

    Temperature of (Tue + Wed + Thu) = 34 x 3 = 102°C

    Temperature of (Mon - Thu) = 111°C - 102°C = 9°C

    Correct Option: D

    Temperature of (Mon + Tue + Wed) = 37 x 3 = 11°C

    Temperature of (Tue + Wed + Thu) = 34 x 3 = 102°C

    Temperature of (Mon - Thu) = 111°C - 102°C = 9°C

    Temperature of [Mon - 4/5(Mon] = 9
    Temperature of Monday = 9 x 5 = 45°C

    ∴ Temperature of Thursday = 45 x 4/5 = 36°C


  1. The average of 11 numbers is 36. Out of these 11 numbers, the average of 9 numbers is 34. If the ratio of remaining two numbers is 2 : 3, find out the smaller number.











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    Sum of 11 numbers = 36 x 11 = 396
    Sum of 9 numbers = 34 x 9 = 306
    Sum of remaining two numbers =396 - 306 = 90

    Correct Option: B

    Sum of 11 numbers = 36 x 11 = 396
    Sum of 9 numbers = 34 x 9 = 306
    Sum of remaining two numbers =396 - 306 = 90
    ∴ The smaller number = (2 x 90)/(2 + 3) = 180/5 = 36



  1. The average of 5 consedutive old posstive integers is 9. The least one amonge them
    is









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    Let the 5 consecutive positive integers be x + 1, x + 3, x + 5, x + 7, x + 9
    Average = (Sum of all terms) / (Number of terms)
    ⇒ 9 = [(x + 1) + (x + 3) + (x + 5) + (x + 7) + (x + 9)]/5

    Correct Option: A

    Let the 5 consecutive positive integers be x + 1, x + 3, x + 5, x + 7, x + 9
    Average = (Sum of all terms) / (Number of terms)
    ⇒ 9 = [(x + 1) + (x + 3) + (x + 5) + (x + 7) + (x + 9)]/5
    ⇒ 9 = (5x +25)/5
    ⇒ 45 = 5x + 25
    ⇒ 5x = 45 - 25
    ∴ 5x = 20 ⇒ x = 4
    The least one is x + 1 = 4 + 1 = 5


  1. The average of the test scores of a class of 'm' students is 70 and that of 'n' students is 91. When the scores of both the classes are combinde, the average is 80. What is n/m ?









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    According to the question,
    70m + 91n = 80 (m + n)

    Correct Option: D

    According to the question,
    70m + 91n = 80 (m + n)
    ⇒ 70m + 91n = 80m + 80n
    ⇒ 10m = 11n
    ⇒ n/m = 10/11



  1. If 47a + 47b = 5452, what is the average of a and b ?











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    Find a + b then Average = (a + b)/2

    Correct Option: D

    47(a + b) = 5452
    ⇒ a + b = 5452/47 = 116
    ∴ Average value = (a + b)/2
    = 116/2
    = 58