Campus Maths Puzzle Numerical Ability Number System

A natural number N, when divided by D, leaves a remainder of 17. When 3N is divided by D if the remainder is 7, what is the remainder when 8N is divided by D?
A)1
B)18
C)4
D)Cannot be determined

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Campus Other Question
In a square , all the mid points are joined. the inner squareis shaded. If the area of the square
is A, what is the shaded area? DH4,HL4,TY4,PS4 find the odd one in that