Question 250396
Let the width = x
Then the length = 2x - 7
Hence the perimeter = 2x + 2(2x-7) = 34
=> 2x + 4x - 14 = 34
=> 6x = 34 + 14 
=> 6x = 48
=> x = 48/6
=> x = 8

Hence the width = 8 cm
length = 2x8 - 7 = 16 - 7 = 9 cm