Can someone help me with this math question please?
2017-12-30 11:53 pm
A bag contains 6 yellow beads and a number of green beads. When a bead is selected at random, the probability that a yellow bead is selected is 2/5 (two over five). How many green beads are in the bag?
回答 (8)
2017-12-31 12:11 am
✔ 最佳答案
Let n be the number of green beads.P(A yellow bead is selected) = 2 / 5
(Number of yellow beads) / (Total number of beads) = 2 / 5
6 / (6 + n) = 2 / 5
2 * (6 + n) = 5 * 6
12 + 2n = 30
2n = 18
n = 9
Number of green beads = 9
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Check :
P(A yellow bead is selected) = 6 / (6 + 9) = 6 / 15 = 2 / 5
2017-12-31 12:22 am
The probability of picking a yellow bead is 2/5 so that means 2/5 of the total beads are yellow and the rest are green.
Let x be the total number of beads:
(2/5)x = 6
x = 6 * 5/2
x = 30/2
x = 15
So if there are 15 beads where 6 are yellow, the remaining 9 must be green.
15 - 6 = 9
Answer:
9 green beads
Let x be the total number of beads:
(2/5)x = 6
x = 6 * 5/2
x = 30/2
x = 15
So if there are 15 beads where 6 are yellow, the remaining 9 must be green.
15 - 6 = 9
Answer:
9 green beads
2017-12-31 3:55 am
23
2017-12-31 12:02 am
With ratios, add them together to find the total number of parts:
eg 2/5 means there are 2 + 5 = 7 parts
if 2 parts = 6 beads, 1 part must be 3 beads
5 parts must be 5 x 3 = 15 green beads
eg 2/5 means there are 2 + 5 = 7 parts
if 2 parts = 6 beads, 1 part must be 3 beads
5 parts must be 5 x 3 = 15 green beads
2017-12-30 11:56 pm
6 x 5/2=15 total beads. 15-6=9 green beads
2018-01-01 11:09 am
Cut the yellow beads in half to 3. Now instead of 2/5, you have 1/5 or (20%). To get 100%, multiply 20% (3 beads) by 5 and you get 15. You have 15 beads total, but 6 of them are yellow. So to find out how many green beads you have, subtract the total amount of beads by the yellow beads. (15 - 6 = 9).
The answer is 9 green beads.
The answer is 9 green beads.
2018-01-01 5:30 am
For every 2 yellow beads there are 3 green beads (five beads total). 2x3=6 yellow beads and 3x3=9 green beads. 15 total beads. 6/15=2/5
2017-12-31 7:01 pm
6/(6 + G) = 2/5
so, 30 = 2(6 + G)
=> 2G + 12 = 30
i.e. 2G = 18
=> G = 9
Hence, 9 green and 6 yellow beads are in the bag
:)>
so, 30 = 2(6 + G)
=> 2G + 12 = 30
i.e. 2G = 18
=> G = 9
Hence, 9 green and 6 yellow beads are in the bag
:)>
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