Total work = 30 × 48 = 1440 units According to question; 33 × x + 15 × (x + 64) = 1440 Or, 33x + 15x + 960 = 1440 Or, 48x = 480 Or, x = 10
An examinee is required to answer 7 questions out of 14 questions, which are divided into two groups each containing 7 questions. He is not permitted to...
In how many different ways can 6 boys and 3 girls to be seated in a row such that all the boys seated together and all the girls seated together?
A man has 15 friends out of which 7 are his relatives. In how many ways can he invite his 9 friends in which at least 5 must be his relatives?
In how many different ways can the letter of the word CHESTNUT is arranged so that vowels always occur together?
In how many different ways can the letters of the word 'COMPUTER' be arranged in such a way that the vowels always come together?
There are 10 boys and 15 girls in the commerce class. Three students are selected at random. Find the probability that 2 girls and 2 boys are selected.
In how many different ways can the letters of the word QUANTITY be arranged so that the vowels always come together?
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...
How many words can be formed with the letter of the word ‘NUMBER’ when alll vowels are never together?
In how many different ways can the letters of the word ‘VARIOUS’ be arranged in such a way that the vowels occupy only the odd positions?
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