SOLUTION: How many green blocks should be added to a bag that holds 1 blue block and 3 yellow blocks to make the probability of randomly selecting a green block from the bag equal to 1/2?

Question 653608: How many green blocks should be added to a bag that holds 1 blue block and 3 yellow blocks to make the probability of randomly selecting a green block from the bag equal to 1/2?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
How many green blocks should be added to a bag that holds 1 blue block and 3 yellow blocks to make the probability of randomly selecting a green block from the bag equal to 1/2?
------
Let the number be "x":
---
Equation:
x/(1+3+x) = 1/2
----
x/(x+4) = 1/2
2x = x+4
x = 4 (# of green blocks to add)
======================
Cheers,
Stan H.
RELATED QUESTIONS
Sam has a bucket of blocks. He has 3 yellow blocks, 10 blue blocks, 6 green blocks, 8 red (answered by stanbon,ewatrrr,bucky)

Carmen is playing with blocks. She arranges stacks of blocks so that each successive... (answered by Theo)

Carmen is playing with blocks. She arranges stacks of blocks so that each successive... (answered by Fombitz)

A box contains 6 blocks, identical except for color. The colors are two red, two white,... (answered by oscargut)

A bag contains only red blocks, white blocks, and black blocks. The probability of... (answered by Fombitz)

Five blocks are painted red, blue, green, yellow, and white. In how many different ways... (answered by alicealc)

A bag contains 12 blocks. Six are red, two are blue, and three are green, and the rest... (answered by htmentor)

A bag contains 36 red blocks, 48 green blocks, 22 yellow blocks, and 19 purple blocks.... (answered by Boreal)

There are 18 green blocks in a bag. There are 3 white blocks for every 2 green blocks.... (answered by MsRedz123)