self Maths Puzzle

a number when divided by D leaves remainder of 3 and when divided by 3D leaves a reminder of 21.what is the remainder left,when twice the number is divided by 3D?

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self Other Question

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What is the sum which earned interest?

I.

The total simple interest was Rs. 7000 after 7 years.

II.

The total of sum and simple interest was double of the sum after 5 years.

A. I alone sufficient while II alone not sufficient to answer
B. II alone sufficient while I alone not sufficient to answer
C. Either I or II alone sufficient to answer
D. Both I and II are not sufficient to answer
E. Both I and II are necessary to answer
8men and 10women can do work in 25 days,the same work can be done by 10children and 5 women.in how many days can 2 children and 3 men do the same work.