CTS Company Numerical Ability Time and Work

a and b can do a piece of work in 28 days. with the help of c, they can finish it in 21 days .how long will c take to finish it

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CTS Other Question
Five farmers have 7,9,11,13 & 14 apple trees respectively in their orchards.last year each of them discovered that every tree in their own orchard bore exactly d same no of apples.further,if d 3rd farmer gives one apple to the 1st,& the 5th gives 3 to each of the 2nd & d 4th,they would all exactly have the same no of apples, what were d yields per tree in the orchards of d 3rd & 4th farmers? Statements: All mobiles are androids.
No android is a phone.
Conclusions: I. Some mobiles are not phones.
II. No phone is a mobile
2) If only conclusion II follows.
3) If either conclusion I or II follows.
4) If neither conclusion I nor II follows.
5) If both conclusions I and II follow.