Question

Three carpenters P, Q and R are entrusted with office furniture work. P can do a job in 42 days. If Q is 26% more efficient than P and R is 50% more efficient than Q, then Q and R together can finish the job in approximately

11 days
13 days
15 days
17 days

Answer 1

Answer:

♠ The correct option is B.

Step-by-step explanation:

Assume that P does x units of work in one day.

Total work = 42x

One day work of Q = 1.26x units

One day work of R = 1.26x × 1.5 = 1.89x units

Total work done by Q and R in one day = 1.26x + 1.89x = 3.15x

♦ So, Q and R can finish the work in 42x/3.15x = 13 days approximately.

Answer 2

Answer:

Step-by-step explanation:

The correct option is B.

Step-by-step explanation:

Assume that P does x units of work in one day.

Total work = 42x

One day work of Q = 1.26x units

One day work of R = 1.26x × 1.5 = 1.89x units

Total work done by Q and R in one day = 1.26x + 1.89x = 3.15x

♦ So, Q and R can finish the work in 42x/3.15x = 13 days approximately.