Subject
Quantitative Aptitude
Topic
Unitary Method
A group of workers can do a piece of work in 24 days. However, as 7 of them were absent it took 30 days to complete the work. How many people actually worked on the job to complete it? (একদল শ্রমিক 24 দিনে একটি কাজ করতে পারেন। তবে, তাদের মধ্যে 7 জন অনুপস্থিত থাকায় কাজটি শেষ করতে 30 দিন সময় লেগেছিল। কতজন লোক আসলে কাজটি শেষ করার জন্য কাজ করেছিল?)
A group of workers can do a piece of work in 24 days. However, as 7 of them were absent it took 30 days to complete the work. How many people actually worked on the job to complete it? (একদল শ্রমিক 24 দিনে একটি কাজ করতে পারেন। তবে, তাদের মধ্যে 7 জন অনুপস্থিত থাকায় কাজটি শেষ করতে 30 দিন সময় লেগেছিল। কতজন লোক আসলে কাজটি শেষ করার জন্য কাজ করেছিল?)
ক)
35খ)
30গ)
28ঘ)
42Explanation
Let, the workers can do in 24 days is = x So, x workers need = 24 days 1 " " = 24x " x-7 " " = 24x / (x - 7) days According to the question: 24x / x - 7 = 30 or, 24x = 30x - 210 or, -6x = -210 x = 35 Workers actually worked = 35 - 7 = 28Related questions
20 men can finish a work in 30 days. After how many days should 5 men leave the work so that the work may be finished in 35 days ?A certain number of men can finish a piece of work in 100 days. If there were 10 men less, it would take 10 days more for the work to be finished. How many men were there originally ?