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If a certain task is distributed among A,B,C and D in the ratio 2:5:7:9 in 1 day then D performs 1800 task in 1 day.

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If a certain task is distributed among A,B,C and D in the ratio 2:5:7:9 in 1 day then D performs 1800 task in 1 day. Then how many task is completed for 2day when A and B works?

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D=9x =1800 

x=200.

 A and B when combines in 1 day they does 

= 2x+5x=7x 

7*200=1400 

For 2 days they complete 1400*2=2800 task.

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