Aptitude Notes 1. Time & Work MCQ
Aptitude Notes
1. Time & Work
( MCQ - 1 to 4)
Question : 1
A and B complete a work in 6 days. A alone can do it in 10 days. If both together can do the work in how many days?
A. 3.75 days
B. 4 days
C. 5 days
D. 6 days
Answer : A. 3.75 days
Explanation:
1/6 + 1/10 = 8/30 = 4/15,
15/4 = 3.75 days
Question : 2
A B together can do a piece of work in 8 days. If A alone can do the same work in 12 days, then B alone can do the same work in?
A. 20 days
B. 16 days
C. 24 days
D. 28 days
Answer : C. 24 days
Explanation:
B = 1/8 – 1/2 = 1/24 => 24 days
Question : 3
A can do a piece of work in 4 days. B can do it in 5 days. With the assistance of C they completed the work in 2 days. Find in how many days can C alone do it?
A. 10 days
B. 20 days
C. 5 days
D. 4 days
Answer : B. 20 days
Explanation:
C = 1/2 - 1/4 - 1/5
= 1/20 => 20 days
Question : 4
A and B can do a piece of work in 6 2/3 days and 5 days respectively. They work together for 2 days and then A leaves. In how many days after that B will complete the work alone.
A.2 days
B. 1 ½ days
C. 3 days
D. 3½ days
Answer : B. 1 ½ days
Explanation:
3/20 * 2 + (2 + x)/5
= 1, x = 1 ½ days
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