Me with these 2 math problems
1. jennifer works in a flower shop. on saturday she started work at 8: 45 am. she spent 3/4 hour at lunch. she finished at 4: 15 pm. how many hours did she work on saturday? answer choices: 6 hours, 6 1/2 hours , 6 3/4 hours
2. jacks height was 68 1/2 in june. he had grown 1 5/8 during the school year. how tall was he when school started ?
answer choices: 66 7/8 inches, 66 1/8 inches , 67 inches me with these 2 math problems

The answer is and 3/4 because 3/4 of an hour is 45 minutes

The first problem's answer is 6 3/4 hours because if you take away 45 minutes from 4:15 you will get 3:30. So if you add 6 hours 8:45 you will get 2:45, so then all you have to do is add another 3/4 hour, so the answer to no. 1 is 6 3/4 hours.

The answer to the second problem is 66 7/8 because if you change 68 1/2 to 68 4/8 then you subtract 1 you get 67 4/8. Then you subtract 4/8 leaving you with an additional 1/8. You then have 67. Then you subtract 1/8 from 67 and you get 66 7/8.

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