There are balloons for sale at the fair, 7/10 of the balloons are blue, 1/5 are red, and the rest are yellow balloons. How many balloons are there in all?
well, you know that 9/10 are either blue or red.
So, 1/10 are yellow. If you can ascertain how many yellow balloons there are, then you can figure out the total.
To find out how many balloons are there in total, we need to add up the number of blue balloons, red balloons, and yellow balloons.
Let's start by finding the number of blue balloons. We know that 7/10 of the balloons are blue. To find the number of blue balloons, we can multiply the fraction by the total number of balloons:
Number of blue balloons = (7/10) x Total number of balloons
Similarly, the number of red balloons is 1/5 of the total number of balloons:
Number of red balloons = (1/5) x Total number of balloons
Finally, we can find the number of yellow balloons by subtracting the sum of blue and red balloons from the total number of balloons:
Number of yellow balloons = Total number of balloons - (Number of blue + Number of red balloons)
Once we calculate these three values, we can add them to find the total number of balloons.