Question

I suck at math ;^; help meeeeeeeeeeee
A student solved this problem and said the answer is 3 feet.

Chase had a roll of ribbon that contained 7 7/8  feet of ribbon. He cut off one piece that was 3 5/8  feet long and another piece that was 1 1/4  feet from the roll. How much ribbon was left on the roll?

Is the student's answer reasonable?


Yes, the answer is reasonable.


No, the answer is not reasonable. It should be about 2 feet.


No, the answer is not reasonable. It should be about 13 feet.


No, the answer is not reasonable. It should be about 4 feet.

Answer 1

Answer:

Well the answer isn't EXACTLY 3 feet, but it's very close at 2.91

Step-by-step explanation:

First we convert all values to decimals to save time.

To convert a mixed number to a decimal you divide the numerator by the denominator and put the whole number in front of it

7/8=0.875

0.875+7=7.875

5/8=0.625

0.625+3=3.625

1/4=0.25

0.25+1=1.25

Now we subtract the original value (7 7/8 or 7.875) from all the cut pieces to find out how much is left.

7.875-3.625=4.16

4.16-1.25=2.91.

And there you go.