if the balls are in the ratio of 7:10, then in every 7+10 = 17 of them 7 are white and 10 are black.
With 136 marbles there are 136 ÷ 17 = 8 lots
→ there are 8 lots × 7 white/lot = 56 white.
24 red marbles
Two.
There are at least 11 green marbles in the bag.
12
10 Green marbles, 13 Blue marbles.
The first could be white, the second could also be white, but for the third there are no white left so the third would have to be black. The first or second could be black, but to guarantee at least one black you need to remove 3 marbles.
Number of possibilities for one category / Total of all possibilities. For example, if I had a bag of marbles where there are three white marbles and two black marbles. The probability of pulling out a white marble is how many white marbles are in the bag which is: three. But the total of things you can draw out of the bag can either be one of the three white marbles or one of the two black marbles. 3 white marbles+ 2 Black marbles= five marbles. Possibility is 3/5 for drawing a white marble.
a bag contains 150 marbles some of the marbles are blue and the rest of the marbles are white in the bag there are 21 blue marbles for every 4 white marbles how many of each color marble blue and white are in the bag show or explain your thinking
12 blue marbles
12 blue marbles
24 red marbles
24
The marbles are now in a ratio of 4:1 between them. Ben has 72 marbles Bill has 18 marbles
The maximum number of marbles you have to draw is three. 1) Draw a marble. It is either white or black. 2) Draw a second marble. If it is the same colour as the first marble, we are done after two draws. 3) Otherwise, the drawn marbles have different colours. Draw a third marble. No matter what you draw next, you must have two marbles of the same colour.
if there are half as many blue marbles as there are red marbles in a bag then the ratio is 1:2 that you will pull a blue marble. it can also be written as 1 over 2 or 1/2 or .5
4: Because there will be at least 1 of two kinds of marbles, and 2 of the other. Ex: 1 black, 1 red, and 2 whites.
Two.