Average age of A, B, C is 90yrs, however when D joins them, then the average comes down to 80 yrs. Now a new person E, whose age is six-fifth of the age of D, replaces A and the new average is 78. What is age of A? A) 64 B) 68 C) 62 D) 66

1 Answer

Answer :

B)

according to the question

A+B+C/3=90

=> A+B+C =270…………..(1)

A+B+C +D/4=80

=> A+B+C +D=320………(2)

From the equation 1 and 2

D=50

E =6/5×50=60

E+B+C +D/4=78

=> E+B+C +D =312

B+C +D =312-60=252……………..(3)

From 2and 3

The age of A=320-252=68

Related questions

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