Question
25 men can complete a piece of work in 13 days. One man
starts the work and after every day one more man joins the work and this continues till the work is completed. Then, in how many days will the work be completed?Solution
Let 1 day work of 1 man = 1 units So total work = 25 ×13 = 325 units Suppose after n days work is finished. So, 1 + 2 + ………… +n = 325 ⇒ (n(n+1))/2 = 325 n² + n – 650 = 0 n² + 26n – 25n – 650 = 0 n(n + 26 ) – 25(n + 26) = 0 (n - 25)  (n + 26) ∴ n = 25 Hence, the work will be finished in 25 days.
In the following question, four words are given, out of which only one word is correctly spelt. Find the correctly spelt word.
Directions: In each question below, four words printed in bold type are given. These are numbered (A), (B), (C) and (D). One these words printed in bol...
Choose the word with the correct spelling.
- Select the INCORRECTLY spelt word.
In each question below, a sentence is given with a part of it printed in bold type. That part may contain a grammatical error. Each sentence is followe...
Find the correctly spelt word. Â
If only the routine criminal process is pursued with a universal sense of urgent , the expediency of special courts may not be needed at all.
...Select the CORRECTLY spelt word.
1) asociation
2) alliance
3) impliment
4) lothe
In each of the questions below, a sentence is given with four words highlighted in bold in the sentence. Among these bold words, one may be wrongly spe...
