Homework Help: math

Posted by Anonymous on Tuesday, May 18, 2010 at 10:55pm.

the number of red marbles varies inversely as the square of the number of blue marbles. when there were four reds, there were 20 blues. How many reds would there be if there were only four blues?

math - wade, Tuesday, May 18, 2010 at 10:56pm
100
math - Reiny, Wednesday, May 19, 2010 at 12:13am
r = k/b^2 , r is red, b is blue

4 = k/400
k = 1600
then r = 1600/b^2

when b = 4
r = 1600/16
= 100

Answer this Question

Related Questions

Math - 6 red marbles 5 yellow marbles and 4 blue marbles. Write a fraction in ...
Math - In a bag of marbles, 3/5 of them are blue and the rest are red. If the ...
Algebra - A jar contains red, blue and yellow marbles.The number of red marbles ...
Math - Jim has a total of 77 red and blue marbles. The number of blue marbles is...
math - There are 3 white marbles, 8 red marbles, 3 blue marbles anf 1 black ...
math - Danny has 75 marbles in red color and blue color. He found out number of ...
math - in a jar of 40 marbles there are 12 red marbles 19 blue marbles and there...
math - sally has a bag with red,blue, and green marbles. She has twice as many ...
probability - George has a bag of marbles. Inside the bag are 5 red marbles, 3 ...
Math 102 - A bag contains six marbles, of which four are red and two are blue. ...

For Further Reading

First Name:
School Subject:
Answer: