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Diameters of three inlet pipes of a cistern = 1.5 : 2 : 2.5 = 3:4:5 Ratio of efficiency will be = Square of diameter => 9 : 16 : 25 Total work = Time x Maximum diameter efficiency = 216 min x 25 If all three work = (216 x 25)/50(9+16+25) = 108 min = 1 hour 48 min
An examinee is required to answer the eight questions out of 16 questions which are divided into two groups each containing eight questions each and he...
Find the number of words that can be formed by using all letters of the word 'PAINT', if order of vowels remains same.
How many five digit numbers can be formed using the digits 0, 1, 2, 3, 4 and 5 which are divisible by 5, without repeating the digits?
In an election, a voter can vote for any number of candidates not exceeding the number to be elected. There are 7 candidates and 4 members to be elected...
In a Group of 8 boys and 6 girls, Six children are to be selected. In how many different ways can they be selected such that at least one boy should be ...
A committee of 4 people is to be formed from a group of 10 individuals. If 2 specific individuals refuse to work together, how many different committees...
In how ways can the selection be made so that a particular member is always excluded?
Salman has a list of 12 friends. He wishes to invite some of them in such a manner that he can enjoy maximum number of parties, but in each party the nu...
A total of 24 points are given on a plane, out of which 10 are collinear. How many distinct straight lines can be formed using these points?
In how many ways can 7 boys and 2 girls can be seated in a row so that they are in alternate position.
