90 persons can dig a well in 40 days. After they have worked for 10 days, how many more persons should be employed so as to complete the work in another 20 days?

90 persons can dig a well in 40 days. After they have worked for 10 da

1.	90 persons can dig a well in 40 days. After they have worked for 10 days, how many more persons should be employed so as to complete the work in another 20 days?
A.	12
B.	18
C.	22
D.	26
E.	None of these
Answer» F.

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90 persons can dig a well in 40 days. After they have worked for 10 days, how many more persons should be employed so as to complete the work in another 20 days?

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