Aptitude - Time and Work - Discussion
Discussion Forum : Time and Work - General Questions (Q.No. 1)
1.
A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is :
Answer: Option
Explanation:
| A's 1 day's work = | 1 | ; |
| 15 |
| B's 1 day's work = | 1 | ; |
| 20 |
| (A + B)'s 1 day's work = |  |
1 | + | 1 |  |
= | 7 | . |
| 15 | 20 | 60 |
| (A + B)'s 4 day's work = | |
7 | x 4 | |
= | 7 | . |
| 60 | 15 |
| Therefore, Remaining work = | |
1 - | 7 | |
= | 8 | . |
| 15 | 15 |
Discussion:
355 comments Page 16 of 36.
Nishi said:
1 decade ago
How did you get 7/15 after simplifying 7/60 ? Didn't understand the simplification of 7/60 to 7/15 Please explain.
Honeymayee said:
2 decades ago
Power of a=p1=w/15
Power of b=p2=w/20
Work is same so p1*15=p2*20
p1/p2=4/3
Now I do not know how to proceed. ?
Power of b=p2=w/20
Work is same so p1*15=p2*20
p1/p2=4/3
Now I do not know how to proceed. ?
Geek said:
1 decade ago
1-((1/20+1/15)*4)==>1-7/15==>8/15.
This is easy method, I think. If any other easy method please give me.
This is easy method, I think. If any other easy method please give me.
GAGAN said:
7 months ago
15, 20 LCM 60.
A = 4
B = 3 TOTAL WORK 60
A + B WORK
then 4 + 3 = 7,
TOTAL 28
60 - 28 = 32.
32/60.
= 8/15.
A = 4
B = 3 TOTAL WORK 60
A + B WORK
then 4 + 3 = 7,
TOTAL 28
60 - 28 = 32.
32/60.
= 8/15.
(23)
Nikhil said:
8 years ago
@Fazeena.
The work completed in 4 days is 7/15. Therefore remaining work is 1-(7/15). So, total work is 1.
The work completed in 4 days is 7/15. Therefore remaining work is 1-(7/15). So, total work is 1.
Rakesh said:
2 years ago
1/15+1/20 LCM of this is 60.
So,
(1/15 * 60 + 1/20 * 60)/60we can simplify this you can get (4+3)/60 = 7/60.
So,
(1/15 * 60 + 1/20 * 60)/60we can simplify this you can get (4+3)/60 = 7/60.
(4)
Shurti said:
8 years ago
@Tabbu.
Here 1 means the whole part.
So subtract the work done from the whole work to get remaining work.
Here 1 means the whole part.
So subtract the work done from the whole work to get remaining work.
Rohit wadile said:
1 decade ago
(a*b)/a+b = work out.
(15*20)/15+20 = 4.
300/35 = 4.
7/15.
Remaining Work = (1-7/15).
Answer = 8/15.
(15*20)/15+20 = 4.
300/35 = 4.
7/15.
Remaining Work = (1-7/15).
Answer = 8/15.
Niral said:
1 decade ago
@Sushmoy.
(1 - 7/15) = 8/15.
Denominator of 1 will be 15 so it will be (15-7/15) = 8/15 will be answer.
(1 - 7/15) = 8/15.
Denominator of 1 will be 15 so it will be (15-7/15) = 8/15 will be answer.
Pradosh behera said:
1 decade ago
Work is 1part. A and B work is finished 7/15 part in 4days from 1part. Remaining work is 1 - 7/15 = 8/15.
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