book Maths Puzzle Numerical Ability

The perimeter of a rectangle is 50ft. The width of a rectangle is 5ft. less than the length. Find the length and the width of the rectangle. P = 2w +2L

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please help me with this problem. what is the value of the determinant.
[3 6 8]
[2 4 0]?
[3 6 8]
(this is one determinant)
i am less than 100
The sume of my digits is 4
half of me is an odd number

What number am i?