Five years ago, the average age of P, Q and R was 37 years. With S joining them now, the average of all the four is 39 years. How old is S?
(P+Q+R), five years ago = (37*3)
(P+Q+R), now = (111 + 5*3) years
= 126 years.
P+Q+R+S now = (39x4)years
S, now = (156—126)
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