Amazon Placement Questions & Answers :: Amazon

Answer: Option B

A & B one day work = 1/8
A alone one day work = 1/12
B alone one day work = (1/8 - 1/12) = ( 3/24 - 2/24)
=> B one day work = 1/24
so B can complete the work in 24 days.

 A = 12, A+B = 8, B = ?

Take LCM of A & A+B = 24.

So, A=12*2 = 24, A+B = 8*3 = 24, B = 1*24 = 24.

Answer: B = 24days.

Answer: Option A

A alone one day work = 1/8
B alone one day work = 1/12
Both A and B one day work = (1/8 + 1/12) = (3/24 + 2/24)
= 5/24
so A and B together finish the work in 24/5 day
or 4 4/5 days.

Answer: Option B

x = 13p + 11 and x = 17q + 9

Answer: Option D

Length of the train = (Speed x Time) =50/3 x 9 m = 150 m.

Answer: Option D

First find the 1 day work of both (A & B)
A 1 day's work = 1/10
and
B 1 day's work = 1/15

So (A + B) 1 day's work = (1/10+1/15)
= (3/30+2/30) = 5/30 = 1/6

So Both (A & B) together can finish work in 6 days

Answer: Option B

Here is no explanation for this answer

For the first two numbers there is a difference of 2 and next two nos have difference of 4 and 2 and 4 repeat the procedure