📢 Too many exams? Don’t know which one suits you best? Book Your Free Expert 👉 call Now!


    Question

    Average weight of 25 boys is 60 kg and average weight of

    'n' girls is 45 kg. If average weight of all the boys and girls is 52.5 kg, then find the value of (n - 5).
    A 20 Correct Answer Incorrect Answer
    B 15 Correct Answer Incorrect Answer
    C 25 Correct Answer Incorrect Answer
    D 30 Correct Answer Incorrect Answer

    Solution

    Sum of weight of all the boys = 25 × 60 = 1500 kg Sum of weight of all the girls = 45n kg (1500 + 45n) ÷ (n + 25) = 52.5 Or, 1500 + 45n = 52.5n + 1312.5 Or, 7.5n = 187.5 Or, 'n' = 25 Required value = 25 - 5 = 20

    Practice Next

    Relevant for Exams:

    ask-question