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Marina CMI [18]
3 years ago
15

A sample of iron ore was found to contain 44% iron by weight. How many pounds of iron are in 450LBS of this ore?

Mathematics
1 answer:
marusya05 [52]3 years ago
6 0
So to set this problem up lets understand it.
each percent is out of a whole (100%)
so the whole in this problem is 450 pounds
and to make 44% a usable number we move the percent sign two places over.
.44
to find out how many times .44 goes into 450 pounds we will multiply
(.44×450)=198 pounds
we can check our answer by dividing 198÷450
and getting .44 as our answer
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two crates contain Apple's, pears and oranges. there are 184 apples and pears in crate one and 248 apples and oranges in the sec
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Answer: There are 152 apples.

The explanation is shown below:

- You need to write the following three equations, where a is the the number of apples, p is the number of pears and o is the number of oranges:

1) a+p=184

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3) o=3p

-  You must substitute the equation 3) into the equation 2):

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- Now, you need to solve for p in the equation 1) and then you must substitute it into a+3p=248:

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- Therefore, there are 152 apples.

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3 years ago
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