Question
The average weight of 8 students in a class is (x + 15).
If the average of the first four students is 30 kg and the average of the last four students is 40 kg, find the value of (x + 25).Solution
According to the question, The average weight of 8 students = (x + 15) = 8 * (x + 15) The average weight of first four students = 4 * 30 = 120 The average weight of last four students = 4 * 40 = 160 120 + 160 = 8 * (x + 15) 280 = 8(x + 15) 35 = x + 15 x = 20 x + 25 = 45
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