five years ago the average age of four man was 48 years now in human joints and the average age increased by 2 years what is the age of the new man
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five year ago
avg age of 4 man = 48 years
avg = sum of age of persons / no of persons
48 = x1 +x2...+x4 / 4
avg increased by 2 years
48 +2 =x1 + x2 ... .. x5/5
avg age of 4 man five year ago is 48
avg age now 4×5=20
= 48+20=68
=68+2=x1+x2....x5/5
age of new man will be 70÷5 =14 years .
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