I am having a really hard time with these equation. Any help is appreciated!

Question

1-Blueberry high-fiber muffins contain 54% dietary fiber by mass. If a package with a net weight of 15 oz contains six muffins, how many grams of fiber are in each muffin?

Express your answer to two significant figures

2-a jar of crunchy peanut butter contains 1.27kg of peanut butter. If you use 7.9% of the peanut butter for a sandwich, how many ounces of peanut butter did you take out of the container?

Round to two sig figs

3- In a candy factory, the nutty chocolate bars contain 24.0% pecans by mass. If 3.4 kg of pecans were used for candy last Tuesday, how many pounds of nutty chocolate bars were made?

Round to two sig figs

Answer 1

1. The information given means 54% of the mass of the muffins is fiber. The answer will involve first converting the weight per muffin, (15oz)/(6 muffins), to grams. Mass in grams, m_g, is equal to weight in ounces, w_g, multiplied by 28.35, meaning there are 28.35 grams per ounce (or g/oz). Then, calculate the weight in ounces per muffin and multiply by the conversion factor of 28.35g/oz to get grams per muffin.
2. Next, you need to find how many grams of fiber each muffin contains. You'll just multiply that grams per muffin number by 0.54 to get grams of fiber per muffin, and report that answer with two numbers after the decimal point.
3. First, you'll calculate the number of kilograms of peanut butter that you used by multiplying 1.27kg by 0.079. Next, you'll convert from kg to ounces by multiplying that result by the conversion factor, 35.274ounces/kg to determine the number of ounces used and report the answer with two numbers after the decimal point.
4. First, you'll need to apply a little Algebra to determine how many kilograms of nutty chocolate bars could be made using 3.4kg of pecans. Use the equation, 0.24 m_ncb (for mass of nutty chocolate bars) = 3.4kg of pecans, and solve for m_ncb to get the mass of candy bars produced with 3.4kg of pecans.
5. Next, you need to convert kilograms to pounds using the conversion factor, 2.20 lbs/kg. Just multiply m_ncb by 2.20 to convert your answer to pounds and report the result with two digits after the decimal place.

Does that make sense?