Question
The average age of (x + 7) interns is 19 years. After
adding a 41-year-old mentor, the average rises to 20 years. Find x% of 500.Solution
ATQ,
Total age of interns = 19(x + 7)
According to question,
19(x + 7) + 41 = 20(x + 7 + 1)
19x + 133 + 41 = 20x + 160
19x + 174 = 20x + 160
20x – 19x = 174 – 160
x = 14
So, 14% of 500 = 70
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