80 volunteers take a lie detector test to help police see how accurate this test is. If you pass the test, it means the test thinks you are telling the truth all the time.
Of the volunteers, only 57 people will tell the truth at all times and the rest lie on purpose.
The results show that 3 people who are supposed to lie pass the test and 6 people who are telling the truth fail the test.
What was the accuracy of the test?

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm

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