The average age of five persons in a group is 18 years.A new member joins them & the new average age becomes 25 years less than the age of the new member. What is the age of new member?
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Answer:
48
Let assume 5 persons be a, b, c, d, e now
a+b+c+d+e/5 = 18
a+b+c+d+e = 18 * 5 = 90
a+b+c+d+e+f/6 = f - 25
90+f/ 6 = f- 25
90+ f = 6f - 150
F =48
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