+0  
 
0
36
1
avatar

Box A contains 350 black stones and 500 white stones. Box B contains 400 black stones and 100 white stones. How many black stones and white stones must be moved from Box B to Box A so that 50% of the stones in Box A are black and 75% of the stones in Box B are black?

 Jun 4, 2022
 #1
avatar
0

B==Black,  W==White


(400 - B) /(100 -W) ==3............(1)
(350 + B) / (500+W) ==1...........(2), solve for B,W


B ==175 black stones
W==25 white stones.

 Jun 4, 2022

6 Online Users

avatar