Answer:
a. 3/4 Pounds b. $ 3 he paid
Step-by-step explanation:
Topic: Rule of Three and Convertion Factors
You have to remember the concept of rule of three and know what is teh convertion factor for ounces to pounds.
The convertion factor is
![1 Ounce = 0.0625 Pounds](https://tex.z-dn.net/?f=1%20Ounce%20%3D%200.0625%20Pounds)
Then you use the converstion factor to transform ounces to pounds using a rule of three, like this:
![1 Ounce = 0.0625 Pounds \\12 Ounces = x Pounds](https://tex.z-dn.net/?f=1%20Ounce%20%3D%200.0625%20Pounds%20%5C%5C12%20Ounces%20%3D%20x%20Pounds)
Remember how to find x?
![x = 12 Ounces * \frac{0.0625 Pouns}{1 Ounce} = 0.75 Pounds](https://tex.z-dn.net/?f=x%20%3D%2012%20Ounces%20%2A%20%5Cfrac%7B0.0625%20Pouns%7D%7B1%20Ounce%7D%20%3D%200.75%20Pounds%20)
So you have that in pounds Marty 0.75 Pounds of Granola
Remember how to transform decimals to fractions?
you can multiply by a hundred and divide by hundred having that:
![0.75 * \frac{100}{100} = \frac{75}{100}](https://tex.z-dn.net/?f=0.75%20%2A%20%5Cfrac%7B100%7D%7B100%7D%20%3D%20%5Cfrac%7B75%7D%7B100%7D)
by simplifying you hace that the fraction of pounds Marty Bought is 3/4
a. Marty bought 3/4 pounds of granola
b. if a whole pound costs $ 4 you can use another rule of three like this
![$ 4 = 1 Pound\\$ x = 0.75](https://tex.z-dn.net/?f=%24%204%20%3D%201%20Pound%5C%5C%24%20x%20%3D%200.75)
Solve again for x and you have that
![$ x = 0.75 Pounds * \frac{\$ 4}{1 Pound}](https://tex.z-dn.net/?f=%24%20x%20%3D%200.75%20Pounds%20%2A%20%5Cfrac%7B%5C%24%204%7D%7B1%20Pound%7D)
so you have that Marty paid $ 3 for 3/4 pounds he bought