+0  
 
0
1080
2
avatar+545 

The number of red marbles varied inversely as the square of the number of blue marbles. When there were 4 reds, there were 20 blues. How many reds would there be if there were only 4 blues?

 May 23, 2016
 #1
avatar+33661 
+5

r = k/b^2  where k is a constant.

 

Find k from:  4 = k/20^2   so k = 4*20^2 = 1600

 

When there are 4 blues:  r = 1600/4^2  or r = 1600/16,  so r = 100

.

 May 23, 2016
 #2
avatar+545 
0

okay thank you  :)

Katie-Leigh  May 23, 2016

3 Online Users