make it out of 100, so 40 times 2.5 equals 100 and 18 times 2.5 equals... 45 so its 45 percent
Sonya has no red blue marbles. All she has are 24 blue, 18 red and 12 green.
24
yes, it is 18
it's 20/50 times 19/49 times 18/48 tmes 17/47 etc down to 1/31
First white = 10/20 second white = 9/19 third white = 8/18 fourth white = 7/17 firth white = 6/16 Total probability = 10/20 x 9/19 x 8/18 x 7/17 x 6/16 = 21/1292 ~= 0.0163
9:10
Sonya has no red blue marbles. All she has are 24 blue, 18 red and 12 green.
24 red marbles
24
yes, it is 18
18:20 reduces to 9:10 if you divide both sides by 2
it's 20/50 times 19/49 times 18/48 tmes 17/47 etc down to 1/31
it's the LCM of 18 and 42 18 = 2x32 42 = 2x3x7 LCM = 2x32x7 = 126
You are TOLD that 18 are blue.
I think the trading is the other way around and then the answer is 18 marbles in all.
First white = 10/20 second white = 9/19 third white = 8/18 fourth white = 7/17 firth white = 6/16 Total probability = 10/20 x 9/19 x 8/18 x 7/17 x 6/16 = 21/1292 ~= 0.0163
The marbles are now in a ratio of 4:1 between them. Ben has 72 marbles Bill has 18 marbles