exam Maths Puzzle Numerical Ability

1. The perimeter of a rectangular box is 42 inches. The length of the box is 15 inches more than the width. Determine the dimensions of the rectangle in terms of feet Also find the

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i cant find solution on this algebra problem because of lack knowing on this proble(4x^4 y^3) (-5x^5 y^2) Thanks for any help you can give me.
The digits 1, 2, and 5 can be scrambled to form three digit numbers. How many of these are prime numbers?