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:
351 comments Page 21 of 36.
Rajesh Chowdary said:
2 decades ago
Explanations are good plz share any simple methods other than these
Shubham mishra said:
9 years ago
@Ankit kain.
In the last step why you take 28/60 instead of 60/28?
In the last step why you take 28/60 instead of 60/28?
Praveen behera said:
9 years ago
Why (1- 7/15) is applied as 8/15?
Can anybody explain it please?
Can anybody explain it please?
Vinod said:
1 decade ago
Any one can explain me why we using remaining work 1-7/15 please.
Krishna said:
10 years ago
I'm confused with this step (1 - 7/15). Can anyone explain this?
Parthiban said:
1 decade ago
@Trupti
1-7/15 = (15-7)/15 = 8/15
I hope this will help you !
1-7/15 = (15-7)/15 = 8/15
I hope this will help you !
Merlin said:
1 decade ago
Can you just explain why they are subtracting the answer from 1?
Deepa said:
10 years ago
I'm confused with this stem (1 - 7/15). Can anyone explain this?
Kumar said:
1 decade ago
Why are we subtracting 7/15 from 1 ?
Why not any other number?
Why not any other number?
Dnyaneshwar said:
1 decade ago
1*15 = 15.
15-8 = 7.
So that denominator remains same 7/15.
15-8 = 7.
So that denominator remains same 7/15.
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