A and B can complete a certain work in 24 days and 42 days, respectively. A started the work and after x days, B joined him and the whole work was complete in 20 days. The value of x is:

A and B can complete a certain work in 24 days and 42 days, respective

1.	A and B can complete a certain work in 24 days and 42 days, respectively. A started the work and after x days, B joined him and the whole work was complete in 20 days. The value of x is:
A.	11
B.	9
C.	13
D.	7
Answer» D. 7

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A and B can complete a certain work in 24 days and 42 days, respectively. A started the work and after x days, B joined him and the whole work was complete in 20 days. The value of x is:

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