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.
Select the related odd word/letters/number/ figure from the given alternatives.
If in the word " JOURNAL ", all the consonants are changed to 3rd preceding and all the vowels are changed to immediately preceding letter as per the En...
Find out the odd word/letters/number/number pair from the given alternatives.
Find the odd one out.
In each of the following questions, a group of four words / letters /numbers are given. Choose which is odd?
Out of the given words, three are similar in a certain manner. However, one option is NOT like the other three. Select the option which is different fr...
Three of the following four options are alike in a certain way based on the Alphabetical series. Which one among the following doesn’t belong to the g...
Find the one which does not belong to that group?
Four number-pairs have been given, out of which three are alike in some manner and one is different. Select the number-pair that is different.
Four words have been given, out of which three are alike in some manner and one is different. Select the odd word.
Relevant for Exams:
