00:01
For this question, we're given that a school had a fundraising event.
00:04
The revenue came from three sources.
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Ticket sales, auction sales, and donations.
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Ticket sales account for three -fourths of the total revenue.
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Auction sales account for one -fifth of the total revenue.
00:19
So we need to determine what fraction of the revenue came from donations.
00:24
To start, let's make sure we understand the problem.
00:27
So we know that the revenue came from three separate sources, ticket sales, auction sales, and donations.
00:35
So we can say that revenue equals ticket sales plus donation sales plus donations.
00:48
So now that we've represented the situation with an equation, we can fill in the numbers that we're given.
00:54
So we know that ticket sales account for three -fourths of the total revenue.
00:59
So i can fill in ticket sales with the fraction three forks.
01:04
We also know that auction sales account for one -fifth of the total revenue.
01:09
So i can fill in auction sales with the fraction one -fifth.
01:14
So now what i'm missing is a number to represent revenue and a number to represent donations.
01:21
We know from the question that donations is what we're looking for.
01:25
So i'm going to fill in donations with a variable d.
01:29
Since that's going to be our unknown.
01:32
Next, we need to fill in a number for the revenue.
01:35
To do this, consider the fact that the revenue is the entire amount of money made in the fundraising event.
01:42
That is, the revenue is the whole made up of fractional parts, ticket sales, auction sales, and donations.
01:51
So, since revenue represents the whole, and we know the other components are fractions, we're going to plug in.
01:59
The whole number 1 in place of the revenue.
02:03
Now rearrange the equation to isolate d...