exam Maths Puzzle Numerical Ability

the perimeter of rectangle 240 cm. its length is decreased by 10% & its breadth increased by 20 we get the same perimeter find the length & breadth of rectangle

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Harry is 4 years older than Marvin. In six years Marvin will be 5/6 as old as Harry. How old is each boy? Now, I think the equation should have been 4 + 5/6 = 6 + 5/6. Given that (3x-a)(x-7)=3x^3-32x^2+81x-70, determine the value of a.