alleryA does a job in 10 days and B in 15 days. After they work together for 3 days, the part left is
A1/3
B1/2
C1/4
D2/3
Answer & Solution
Correct answer: B. 1/2
Together they do 1/6 per day, so 3 days gives 1/2 done and 1/2 remains.
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