If a farmer sells 15 of his chickens, his stock of feed will
last for 4 more days than planned, but if he buys 20
more chickens, he will run out of feed 3 days earlier
than planned. If no chickens are sold or bought, the
farmer will be exactly on schedule. How many chickens
does the farmer have?
Say farmer has n chicken and he is good for d days.:-
We have 3 equations given in question:-
(n-15) * d+4 =(n+20) *(d-3) = n * d
Solving these: (You can solve 1st and 3rd and 2nd and 3rd together)
Ans E it is!
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