Question
In an examination the average marks of Rohit is 60. If
he got 15 more marks in science and 21 more marks in maths then his average would have been 66. Find the total number of subjects he studied?Solution
Let total number of subjects be x. Then, => (60x + 21 + 15)/x = 66 => 60x + 21 + 15 = 66x => 6x = 36 => x = 6
There are 10 members in a delegation which is to be sent at SAARC summit. The total number of members is 18. In how many ways can the selection be made ...
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Find total number of ways in which the word “DEPRESSION” can be arranged.
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History books are always together and also Geography books are always together?
In how many ways can 4 boys and 3 girls can be seated in a row so that they are in alternate position.
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