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x3 + y3 + z3− 3xyz (x + y + z)(x2 + y2 + z2 − xy − yz − zx) x3 + y3 + z3 − 3xyz (x + y + z)((x + y + z)2 − 3(xy + yz + zx) 13-3(1)=(1)(1-3((xy+yz+zx))) 10=1-3(xy+yz+zx) (xy+yz+zx)= – 3
The average age of 32 children and their teacher's age are 28 years. If the teacher's age is excluded, the average reduces by 1. What is the teacher's age?
There are three classes P, Q and R. The average marks of class P is 75. The average marks of class Q is 80. The averagemarksof class R is 85. The averag...
In a school, the average number of books that some numbers of boys have is 120 and average number of books that some numbers of girls have is 85. If eac...
The average weight of 14 persons increases by 3.5 kg when a new person comes in place of one of them weighing 48 kg. The weight of the new person is.
The average age of a class of 25 girls is 20 years. If 7 new girls having average age of 12 years join the class, then the average age of the class beco...
The average weight of 4 persons is 46 kg. The heaviest person’s weight is 28 kg more than the lightest person’s weight. If the average weight of the...
Average run scored by a batsman in 20 innings is 88. In next 6 innings, he scored runs with an average of ‘x’ so that his overall average increases ...
Each question contains a statement followed by Quantity I and II. Read the information clearly and answer your questions accordingly.
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In an examination, the average marks obtained by the students is 80. After correcting the quantitative mistakes, the average of 90 students is reduced t...
