Question
In each of these questions, two equations (I) and (II)
are given.You have to solve both the equations and give answer  I. x2 – 26x + 168 = 0   II. 2y2 - 19y – 60 = 0Solution
if signs of quadratic equation is -ve and +ve respectively then the roots of equation will be +ve and +ve.  So, roots of first equation = x = -16/3, 1 if signs of quadratic equation is -ve and -ve respectively then the roots of equation will be +ve and -ve. So, roots of second equation = y = 12, -5/2 After comparing roots of quadratice eqution we can conclude that x ≥ y.
10, 15, 25, 35, ?, 65
70, 69, 73, 64,80, 55, ?
13, 28, ?, 118, 238, 478
What will come in place of the question mark (?) in the following number series?
124, 131, 117, ?, 110, 145
80, 116, 52, ?, 8, 204
7 7 ? 43 163 831
...1     1      4       ?      280       3640
...5, 5, 15, 75, ?, 4725
5, 18, 39, ?, 105, 150
8, 58, 75, 94, 115, ?