math  fractions
posted by Johanna .
Hello, I need help for my 5th grader...Solve the problem by working backward. Write the ans. in a compl. sentence. Mara followed a recipe she found on the net to make her own perfume. She started by adding jojoba oil to a small bottle. Then she added 2 1/3ozs of sandalwood oil, 1 1/4ozs of musk oil, and 1 5/12ozs of frankincense oil. Mara made a total of 8ozs of perfume. How much jojoba oil did she use?

First, let's find the common denominators and add the fractions.
2 1/3 = 2 4/12
1 1/4 = 1 3/12
1 5/12 = 1 5/12
________________
. . . . 4 12/12 = 5
Subtract 5 from 8 to find the amount of jojoba oil Mara used. 
In your opinion , when would it be advantageous to record a fractional answer in each of following forms? a mixed number, an improper number, a decimal.
Respond to this Question
Similar Questions

5th grade
We are working on Fractions, mixed numbers and decimals. the problem says  write each decimal as a fraction or mixed number in simplest form... 0.7 or 0.08 ....ugg HELP 
arithmetic
I do not understand my math problem. The problem is below. A recipe for a loaf of bread calls for 3/4 cup of oatmeal. How much oatmeal do you need if you make half the recipe? 
5th Grade fractions
Walt has a piece of rope which is 10 1/3 feet long. He has to cut it into 4 equal pieces. How long will each piece be? 
5th grade math
I am desperately trying to help my 5th grader figure out how many ways can we make this equation true 24 x 18 = 432 x 
5th grade math (dividing fractions)
Hi.. I need help figuring out this problem, sovling for x: 3 divided by x/9 = 5 and 2/5 I was able to solve: x divided by 3/4 = 6 by multiplying 6 x 3/4 = 4 1/2. Just not sure how to solve the first problem. If I change 5 2/5 into … 
5th grade math (dividing fractions)
Can you check this problem? How many twelfths are in one sixth? 
Sixth Grade Simplest Form
Im having a hard time trying to solve this problem. Can someone please help me? 
8th grade algebra
Hello! I was working on a maths thing and I'm a bit lost on this one problem, would anyone mind explaining how to do this? 
Math 5th grade
Hello, can someone please help us solve. Very confused by this one. Carlos made trail mix using 2 cups peanuts, 1 1/2 cups M&M's 1 1/4 cups pretzels and 1 1/14 cup raisins. How many cups of trail mix will this recip. make. and if he … 
Math
Write a word problem involving fractions for which you would use the work backward strategy and addition to solve.Include your solution.