Maths olympiad Exam Numerical Ability

In ∆XYZ, right angle is at Y, YZ = x, and XY = 2x then determine ∠ YXZ and
∠YZX

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Maths olympiad Other Question

veda has 6 coiumns in the name of a,b,c,d,e,f.he has to check that no two columns should have the same entry .she can check only 2 columns at a time how many times will she have to repeat the comparing process to compail the process for the whole file....?
a.7
b.8
c.15
d.10
what will be the increase in area of a circle if its radius is increased by 140%