Aptitude - Time and Work - Discussion
Discussion Forum : Time and Work - General Questions (Q.No. 20)
20.
Sakshi can do a piece of work in 20 days. Tanya is 25% more efficient than Sakshi. The number of days taken by Tanya to do the same piece of work is:
Answer: Option
Explanation:
Ratio of times taken by Sakshi and Tanya = 125 : 100 = 5 : 4.
Suppose Tanya takes x days to do the work.
5 : 4 :: 20 : x  x = |
 |
4 x 20 |  |
| 5 |
x = 16 days.
Hence, Tanya takes 16 days to complete the work.
Discussion:
94 comments Page 7 of 10.
Manjula said:
1 decade ago
Sakshi working days in 20 days means 100%.
Tanya working days ?
100%-75% = 25%
So 20*25/125 = 4.
20 days - 4 = 16 days.
Tanya working days ?
100%-75% = 25%
So 20*25/125 = 4.
20 days - 4 = 16 days.
Vamsi said:
1 decade ago
If Tanya is 25% more efficient than Sakshi, then as 25% of 20 is 5. Tanya should complete the work in 15 days not 16 days.
Pankaj said:
1 decade ago
I too get the answer as 15 days. Since 25% of 20 is 5 we have to subtract like 20-5 = 15 right? but how the answer is 16?
Preethy said:
1 decade ago
I too get the answer as 15 days. Since 25% of 20 is 5 we have to subtract like 20-5=15 rite? but how the answer is 16?
Akash kumar said:
5 years ago
Solve by the Trick:
100 * M/100 + X.
Here, M = day.
X= efficiency.
Therefore:
100 * 20/100 + 25,
2000/125,
16 days.
100 * M/100 + X.
Here, M = day.
X= efficiency.
Therefore:
100 * 20/100 + 25,
2000/125,
16 days.
(6)
Tathagata said:
9 years ago
@Ashwini you are right. If you see a previous sum. If you do it in the same way it will have the same answer!
Suniz said:
2 years ago
Yes, you are correct @Okley.
Why can't 15 be the answer?
25%of 20=5 subtracts from 20 then gets 15, right?
Why can't 15 be the answer?
25%of 20=5 subtracts from 20 then gets 15, right?
(13)
Samar said:
1 decade ago
20*0.25=5
subtract 5 from 20
20-5=15Ans
I also get the answer 15
I did not understand how the answer is 16.
subtract 5 from 20
20-5=15Ans
I also get the answer 15
I did not understand how the answer is 16.
Bulu said:
9 years ago
Shaki = 20 days,
Tanya = 25% more efficient,
So that 25% of 20 = 5,
20 days - 5 days = 15 days.
Tanya = 25% more efficient,
So that 25% of 20 = 5,
20 days - 5 days = 15 days.
Jothikumar said:
7 months ago
Sakshi = 120% of 20 days.
Tanya = 100% of x days.
X= 20*100/120,
X= 20*4/5.
X=80/4.
X= 16 days.
Tanya = 100% of x days.
X= 20*100/120,
X= 20*4/5.
X=80/4.
X= 16 days.
(3)
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