Interview Maths Puzzle Numerical Ability

1^4+2^4+........n^4 where n=90.Find the last digit of sn90.

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Interview Other Question

A and B run around a circle of 0.5 km.The ratio of A:B is 5:3 in terms of distance covered.Then find the distance of A when it overtakes te 5th round of B? Denominations of Rs.2,Rs.5,Rs.10 is available.The sum of the rupees is 500 and the total money is Rs.3130.If the Rs.10 and Rs.5 notes were the interchanged then te total money will reduced by 300.Find the number of Rs.10 notes before swapping.