Time and Work

[eaakbari]

I always seem to mess time and work problems up. Any insight?

[harshavardhanc]

I always seem to mess time and work problems up. Any insight?

E,

I always like to use percentages in these sums/problems. I feel uncomfortable in working with fractions and hence, use percetances instead.

For e.g. if a problem says A can complete work in 10 days. B has twice A's efficiency. In how many days would the work be completed if they work together.

Instead of working with 1/10 and 1/5 , I see work done/day by A as 10% and work done/day by B as 20% and add these two, which gives me 30% of the work done in one day. Therefore, 100% can be completed in 10/3 days

a little practice would make it easier to tackle these problems.

[eaakbari]

I always seem to mess time and work problems up. Any insight?

E,

I always like to use percentages in these sums/problems. I feel uncomfortable in working with fractions and hence, use percetances instead.

For e.g. if a problem says A can complete work in 10 days. B has twice A's efficiency. In how many days would the work be completed if they work together.

Instead of working with 1/10 and 1/5 , I see work done/day by A as 10% and work done/day by B as 20% and add these two, which gives me 30% of the work done in one day. Therefore, 100% can be completed in 10/3 days

a little practice would make it easier to tackle these problems.

Hmmm, yes you definitely make it sound simpler, but that would only be for numbers like 5 and 10 right. Or do you use it for a number like 17 too.

Thanks a bunch

[harshavardhanc]

I always seem to mess time and work problems up. Any insight?

E,

I always like to use percentages in these sums/problems. I feel uncomfortable in working with fractions and hence, use percetances instead.

For e.g. if a problem says A can complete work in 10 days. B has twice A's efficiency. In how many days would the work be completed if they work together.

Instead of working with 1/10 and 1/5 , I see work done/day by A as 10% and work done/day by B as 20% and add these two, which gives me 30% of the work done in one day. Therefore, 100% can be completed in 10/3 days

a little practice would make it easier to tackle these problems.

Hmmm, yes you definitely make it sound simpler, but that would only be for numbers like 5 and 10 right. Or do you use it for a number like 17 too.

Thanks a bunch

ha ha! you apple-picked the best number in this universe!!

don't worry ! numbers like 17 and 19 won't appear in the questions of time and work till the 750 level

However, you may have to learn the reciprocals of numbers till 12. that is 8.33%.

[eaakbari]

Haha , yes actually I did
Your post in Pipe leak (https://www.beatthegmat.com/pipe-leak-t55955.html) made me realize you do use percentages quite elegantly. I shall give the method a try.
Thanks, your a rockstar

E