Jack spends 1 and a quarter as long on his homework as jill. last week jill spent 9 and three quarters of a hour on his homework. how long did jack write the answer as a mixed number! thnx!

Jack spent 11 hours on his homework.  This is because Jill worked 9 3/4 hours on her work, and since Jack worked 1 1/4 hours more than her.  9 3/4 + 1 1/4 = 11.

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