A can complete 50% of a job in 9 days and B can complete 25%

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SSC CGL Tier-2 9-March-2018 Maths-shift-1
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MATH

70

M: +3.00/-0.00

A can complete 50% of a job in 9 days and B can complete 25% of the job in 9 days if they worked alone. If they worked together how much of the job (in %) can they complete in 9 days?

[SSC CGL Tier-2 9-March-2018 Maths-shift-1]

A 80

B 90

C 75

D 100