Question
The average age of (x + 4) friends is 22 years. If a new
friend aged 34 joins, the average becomes 23 years. Find x% of 600.Solution
Total age of friends = 22(x + 4) years According to question, [22(x + 4) + 34] = 23(x + 4 + 1) 22x + 88 + 34 = 23x + 115 22x + 122 = 23x + 115 23x – 22x = 122 – 115 x = 7 So, 7% of 600 = 42
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