Elitmus Exam Numerical Ability

for number system can anyone one tell me from where i will practice the problems for elitmus....plz suggests...

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Elitmus Other Question

E=4*4! + 5*5! + 6*6! ........19*19!
Remainder when E is divided by 64
a)0 b)58 c)others
virat & anushka starts running in clockwise direction at the same time and ratio of their speed is 5:3. it takes 0.5km to complete one round then how much distance will virat cover when he crosses anushka 6th time?