Probabilities are hard... Help please?

Rectangle leg this 11feet and perimeter of 38feet what is the width of the rectangle in feet

Afactory buys 10% of its components from suppliers b and the rest from supplier c. it is known that 6% of the components it buys are faulty. of the components brought from suppliers a,9% are faulty and of the components bought from suppliers b, 3% are faulty. find the percentage of components bought from supplier c that are faulty.

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b