Posted by Tonya on Friday, February 15, 2008 at 5:44pm.
I need help bad.
Fractions
1)1/3 + 5/12 + 4/5 =
2)13/15  11/20 =
3)1 1/15 + 3 3/10  2 4/5 =
4)Robin ran 5 1/3 mi on Sunday, 2 1/4mi on Tues, and 3 1/2mi on Fri. How far did she run during the week?
5)The interest rate on an auto loan in May was 12 3/8%. By September the rate was up to 14 1/4%. How many percentage points did the interest rate increase over the period?
6)Julio works as a quality control expert in a beverage factory. The assembly line that he monitors produces about 20,000 bottles in a 24hour period. julio samples about 120 bottles an hour and rejects the line if he finds more than 1/50 of the sample to be defective. About how many defective bottles should Julio allow before rejecting the entire line?
7)Lunch meat sells for about $3 per pound. You use about 1/2 pound per day for sandwiches. How much should you budget for lunch meat over the next month (about 20 workdays)?
8)17 11/12 / 6 1/10 =

math  Ms. Sue, Friday, February 15, 2008 at 5:50pm
For the first three problems, you need to change these fractions so they have a common denominator. Then add or subtract the numerators.
Example:
1/3 + 5/12 + 4/5 =
The number that's divisible by 3, 12, and 5 is 60.
1/3 = 20/60
5/12 = 25/60
4/5 = 48/60
20/60 + 25/60 + 48/60 = ?
Please attempt the other problems and post your answers. We'll be happy to check them for you.

math  drwls, Friday, February 15, 2008 at 5:56pm
These are exercises in converting to a common denominator, and then adding or subtracting fractions. Here is how to do the first one.
1) The common denominator is 3x4x5 = 60
1/3 + 5/12 + 4/5 = (20+25+48)/60 = 93/60
= 1 33/60 = 1 11/20 = 1.55
Now you try the others. There are many math teachers here willing to help student who make an effort. Someone will be glad to critique your work.

math  george, Saturday, February 26, 2011 at 12:30am
9 1/5  7 6/25 = 46/5  181/25 =
230  181/25 = 49/25 = 1 24/25
Now estimate to see if the answer is reasonable by rounding each mixed number to the nearest integer then subtracting.
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