book Maths Puzzle Numerical Ability

A rectangle has a perimeter of centimeters.The length of the rectangle is 11 centimeters longer than triple the width. Find the dimensions of the rectangle

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I need to solve this inequality 5 different ways. ax+b<c and x<24. I thought I had it once but can't get it to work now. Help please. Please HELP. what is 6y ≤ 7x+2? i need help quick.