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Dahasolnce [82]
3 years ago
5

Which steps could be used to solve this story problem? The zoo has 20 birds in the enclosure. Twelve of the birds are blue, 3 ar

e red, and the rest are orange. How many birds are orange? A. Multiply 12 × 3. Then add that product to 20. B. Add 12 and 3. Subtract the sum from 20. C. Subtract 3 from 12. Then add that difference to 20. D. Divide 20 ÷ 12. Then add 3 to that quotient.
Mathematics
2 answers:
valina [46]3 years ago
4 0
B. Add 12 & 3 to get 15 then subtract 15 from 20. 20 - 15 = 5 Orange birds remaining.
kondor19780726 [428]3 years ago
4 0
B- add 12+3 and subtract from 20
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saw5 [17]
So to solve for this, we need to set up proportional fractions, which I will help show you how to do.
First, if we are given an amount out of a total, we need to put it over x (if we are looking for the total). It looks like this:
12/x, 12 being the given number and x being the total.
If we are given the total but are looking for an amount, put the total at the bottom of the fraction (aka the denominator). It looks like this: x/16, 16 being the total amount and x being the amount out of the total.
We have a total of 40 test problems, so we can put our total at the bottom, x/40.
X is the amount of questions answered correctly (we are looking for x in the question).
We have answered 80% correct, so put 80% over 100 (100 being the total). It should look like this: 80/100.
Now we have our two fractions: x/40 & 80/100.
Set these up as an equation.
x/40 = 80/100.
Now this is where things may get tricky if you don't pay attention.
Multiply the numerator (the top number of a fraction) of x/40 by the denominator (the bottom number of a fraction) of 80/100.
Your product equation should look like this:
x times 100. This will give is 100x. Leave it at that.
Now, multiply the denominator of x/40 (the bottom number of the fraction) by the numerator (the top number of a fraction) of 80/100. It should look like this:
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Now set up our products as an equation.
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To solve for x, divide both sides by 100.
3200/100 = 32.
x = 32.
I hope this helps and has taught you something!
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