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The ratio of red marbles to blue marbles was 5 to 4 if there were 225 in all how many were blue marbles?
Wiki User
∙ 13y ago
The ratio tells us that for every 5 red marbles there are 4 blue ones.
Now the total number is 225.
Out of 9 total marbles, we know 4 are blue.
So we can look at 4 blue/9 total= (x blues which we want to know)/ 225.
This is not hard to solve by cross multiplication.
9x=4(225)
or 9x=900 so x is 100 and there are 100 blue marbles.
Now if that is so, we know the rest of the marbles must be red so there are 225-100=125 red ones.
Let us check that this ratio is 5/4 as desired.
Red/Blue=125/100 and 25 goes into 125 5 times and into 100 4 times so this becomes
5/4.
How else would we do this problem. Since the ratio of 5/4, we know as we said above there are 4/9 blue marbles ( every 4 marbles out of 9 is blue). Now 4/9(225)=4x225/9=100.
Wiki User
∙ 13y ago
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Because you are replacing the marbles then it is an independent event. P(1st one is not green) = 1 - P(first green), equally P(2nd one is not green) = 1 - (second green), Thus it reads P(¬G ^ ¬G) = P(¬G) * P(¬G) = 15/20 * 15/20 = 225/400 = 9/16
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225 feet by 225 feet is 1.162 acres.
What do the small numbers next to the rim on a tire mean?
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How do you write 225 as a fraction?
-2.25 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its rational equivalent is -225/100 which can be simplified, if required.
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no. only in red and blue, and yellow
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