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.
Jasmin said:
1 decade ago
Can you explain me chain rule please?
5:4 :: 20:x.
5:4 :: 20:x.
Geetha said:
1 decade ago
Give a brief explain how 125:100 come?
Anshu said:
1 decade ago
Hey,
You can understand it like this.
As we know working efficiency of sakshi is 1/20.
And working efficiency of tanya is 25% greater.
So tanya eff = 1/20*(125/100)=1/16.
Hence time 16 days.
You can understand it like this.
As we know working efficiency of sakshi is 1/20.
And working efficiency of tanya is 25% greater.
So tanya eff = 1/20*(125/100)=1/16.
Hence time 16 days.
Pavan said:
1 decade ago
Here question starts with sakshi so we must take s=100.
Then 25% eff so T=75.
Then the ratio we get is 3:4.
Answer will be 15.
How can it be 16.
Can anyone please?
Then 25% eff so T=75.
Then the ratio we get is 3:4.
Answer will be 15.
How can it be 16.
Can anyone please?
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.
Iqbal sofi said:
1 decade ago
It should be 15, because the 25% reduction of 20 is 15.
Ramesh said:
1 decade ago
Sakshi's one day work is 1/20.
Tanya is 25% of sakshi it means 1/20+25%1/20.
= (1/20+25/100*1/20).
= (1/20+1/80).
= 1/16 for one day.
So 16 days to do total work.
Tanya is 25% of sakshi it means 1/20+25%1/20.
= (1/20+25/100*1/20).
= (1/20+1/80).
= 1/16 for one day.
So 16 days to do total work.
Shravani said:
1 decade ago
If tanya is 25% more efficient than sakshi (which means tanya>sakshi) then how cum the ratio between sakshi n tanya is 125:100 it should be 100:125 right?.
Sandeep said:
1 decade ago
(1/20 + 25% of 1/20).
Here 25 % of 1/20 is 1/5.
Then add,
(1/20+1/5), we get,
(1+4/20).
Then we get 1/4.
Above we got 4 days, then subtract 20 from 4
20-4 = 16.
Here 25 % of 1/20 is 1/5.
Then add,
(1/20+1/5), we get,
(1+4/20).
Then we get 1/4.
Above we got 4 days, then subtract 20 from 4
20-4 = 16.
Sai said:
1 decade ago
Tanya's one day work =(1/20 + 25% of 1/20) = 1/20+1/80 = 1/16 once explain the equation.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers