# If the work done by (x – 1) men in (x + 1) days and the work done by (x + 2) men in (x – 1 ) days are in the ratio 9 : 10,

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If the work done by (x – 1) men in (x + 1) days and the work done by (x + 2) men in (x – 1 ) days are in the ratio 9 : 10, then the value of x is equal to :

(a) 5

(b) 6

(c) 7

(d) 8

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Correct option (d) 8

Explanation:

Put values in formula