Let's list the factors of 70
1,2,5,7,10,14,35,70.
So 1 and 70 doesn't work since the perimeter is 142. 2 and 35 don't work since it adds up to 74. 5 and 14 work though since the perimeter would equal 38.
So the length and width would be 5 and 14 :D
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