Question
A batsman scores 87 runs in the 21st match of his
career. His average runs per match increases by 2. What was his average before the 21st match.Solution
Sum of scores till 20 matches=S average of 20 matches=x S=20x (S+87)/21 =x+2 20x+87=21x+42 X = 45
If (x - 1) 3 Â + (y - 2) 3 Â + (z - 3) 3 Â + 3(x + y - 3)(y + z - 5)(x + z - 4) = 0, then what is the value of (x + y +...
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If  a 2 + b 2 + c 2 = 40 & ab + bc + ca = 12 then a + b+ c = ?
