in a bag of coloured cubes, the ratio of red cubes to total number of cubes is 5:7. If there are 105 cubes in the bag, how many cubes are red? i don't get this :|
You can set up a ratio:
5/7 = x/105
Cross multiply and simplify if needed.
alright thx!! :)
You're welcome!
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i have another question.
im sorry u have to suffer.:)this is confusing:S
Which country has the greater population density? Wirte its population density. The United kingdom with about 60 million people and an area of 244 800km2 or china with about 1806 million people and an area of 9 590 000 km2.
does anyone know the answer for this?
i mean help me with this?? :P
A bag contains 4 red, 4 blue, and 3 green cubes. Cubes are drawn twice with replacement. Find each probability.
P(both red)
The first cube drawn has a 4/11 chance of being red. Since the cube is replaced, the second cube drawn also has a 4/11 chance of being red. Therefore, the probability of drawing two red cubes is:
P(both red) = (4/11) x (4/11) = 16/121 or about 0.1322 (rounded to four decimal places).
To find the number of red cubes, we need to use the given ratio of red cubes to the total number of cubes.
Let's break down the ratio given: 5:7. This means that for every 5 red cubes, there are 7 cubes in total.
To solve the problem, we need to find the value of 5 in the ratio. We can set up a proportion to solve for the value of 5:
5 (red cubes) / 7 (total cubes) = X (red cubes) / 105 (total cubes)
Cross-multiplying, we get:
5 * 105 = 7 * X
525 = 7X
Dividing both sides by 7:
525 / 7 = X
75 = X
Therefore, there are 75 red cubes in the bag.