SOLUTION: How do I: "Write a proportion and solve" --What percent of 80 is 42? I came up with 52.5% I wrote this down The teacher circled "write a proportion," and marked it

Algebra ->  Algebra  -> Proportions -> SOLUTION: How do I: "Write a proportion and solve" --What percent of 80 is 42? I came up with 52.5% I wrote this down The teacher circled "write a proportion," and marked it       Log On

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Question 68051: How do I:
"Write a proportion and solve"
--What percent of 80 is 42?
I came up with 52.5% I wrote this down
The teacher circled "write a proportion," and marked it wrong.
I did not show my work.
Sammy
Found 2 solutions by stanbon, Earlsdon:
Answer by stanbon(48545) About Me  (Show Source):
You can put this solution on YOUR website!
"Write a proportion and solve"
--What percent of 80 is 42?
--------------
"Percent" implies "per hundred" ; so you
write x/100 = 42/80
Then you solve for x to get the "percent".
80x=4200
x=52.5
42 is 52.5% of 80
------------
Cheers,
Stan H.

Answer by Earlsdon(6103) About Me  (Show Source):
You can put this solution on YOUR website!
You can write the proportion as follows: x percent can be written as x%2F100 and this would be set equal to 42%2F80
x%2F100+=+42%2F80 Solve for x. Multiply both sides by 100.
x+=+%28100%2942%2F80 Simplify.
x+=+420%2F8
x+=+105%2F2
x+=+52.5
The answer, as you have noted, is: 42 is 52.5% of 80