Maths olympiad Exam Numerical Ability Area and Volume

what will be the increase in area of a circle if its radius is increased by 140%

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Maths olympiad Other Question

In ∆XYZ, right angle is at Y, YZ = x, and XY = 2x then determine ∠ YXZ and
∠YZX
three man A, B , C working together can do a job in 6 hours less time than A alone, in 1 hour less time than B alone and in one half the time needed by C when working alone . Then A and B together can do the job in