SSC Government Jobs Exams Numerical Ability Time and Work

A and B working separately can do a piece of work in 9 and 12 days respectively. If the work for a day alternately with a beginning, the work would be completed in

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it takes 101/4 days to complete the work
11 years agoHelpfull: Yes(0) No(0)

suppose the work needs x days to be done
(1/9*x/2)+(1/12*x/2)=1
x=72/7 days
9 years agoHelpfull: Yes(0) No(0)

SSC Other Question

If the radius of a circle is increased by 50%, its area is increased by A and B together can do a work in 10 days. B and C together can do the same work in 6 days. A and C together can do the work in 12 days. Then A, B and C together can do the work in