Question

How long would A take to complete the work ?
Statements :
I. B is half as efficient as A.
II. B and C together complete the work in 8 days
III. A and B together complete the work in 4 days

• A. Only III is sufficient
• B. I and II are sufficient
• C. All of I, II and II are necessary
• D. Only I and III are sufficent

Answer 1

Answer: (D)

Only I and III are sufficent

B's efficiency $=$ 1/2 $\times$ A

Statement 3

A's eff+B's eff$=$ 4

A's eff+A/2 eff$=$ 4

Here we can find out A's efficiency

Hence statement 2 is not required and statement 1 and 2 are only sufficient

option D