Three years ago, the average age of nandu and panna was 18 years. With shubha joining them now their average age became 22 years. How old is shubha now?
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let 'n' and 'p' are the present ages of nandu and panna respectively.
Let 's' be the present age of subha.
3 years ago,
n' = n - 3
p' = p - 3
(n' + p')/2 = 18
(n+P-6)/2 = 18
(n+p) = 42
Present average of 3 girsl = (n + p + s) /3 = 22
(42 + s)= 66
s = 22 years
Step-by-step explanation:
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