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Answer

Correct Option is 4 days

Solution:
There are two possibilitiesFirst – Satish worked first
Second – Veer worked first
When Satish worked first remaining work → 120a – 10(3a+4a) – 7(2a) = 36a
Satish and Veer worked in 3 days = 30a
4th day Satish’s worked = 4a
Veer’s worked for = 1/3 day
Now ‘y’ cannot be in fraction
2nd case-
When Veer worked first-
Veer and Satish worked for first 3 day = 30a
 

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