Marty buys 12 ounces of granola.
a. what fraction of a pound of granola did marty buy?
b. if a whole pound of granola costs $4, how much did marty pay?

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

Then you use the converstion factor to transform ounces to pounds using a rule of three, like this:

Remember how to find x?

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:

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

Solve again for x and you have that

so you have that Marty paid $ 3 for 3/4 pounds he bought

add all the numbers and check the ones place.

the answer is 486. as the ones place is more than 4, the estimation will be the next 10 ie, 490