Homework Help: math

Posted by Gorege on Thursday, December 16, 2010 at 9:17pm.

to identical jars are filled with equal amount of marbles. the marbles are coloured red or white. the ratio of red to white marblesis 7:1 in jar 1 and 9:1 in jar 2 if there are 90 marbles altogether, determin the number of red marbles in jar 2.

math - Reiny, Thursday, December 16, 2010 at 9:53pm
let the number of white marbles in the first jar be x
then the number of red marbles in the first jar is 7x
total in jar 1 is 8x

let the number of white marbles in jar 2 be y
then the number of red marbles in jar 2 is 9y
total in jar 2 is 10y

but 8x = 10y
x = (5/4)y

also 8x + 10y = 90
8(5/4)y + 10y = 90
10y + 10y = 90
y = 4.5

but both x and y must be whole numbers,
Your question is flawed.
math - Gorege, Saturday, December 18, 2010 at 11:39pm
sorry the total of white marbles is 90

Answer this Question

Related Questions

Math - to identical jars are filled with equal amount of marbles. the marbles ...
Math - to identical jars are filled with equal amount of marbles. the marbles ...
Ratio - A jar contains 2 red marbles,6 blue marbles,4 white marbles, and 12 ...
PLEASE HELP! - A jar contains 24 blue marbles, 16 red marbles, and 14 white ...
math - the bag contains 20 red marbles and30 white marbles and 40 blue ones what...
Math - A box contains 3 red marbles, 6 blue marbles, and 1 white marble. The ...
math - in a jar of 40 marbles there are 12 red marbles 19 blue marbles and there...
math - There are 3 white marbles, 8 red marbles, 3 blue marbles anf 1 black ...
Math - A box contains four red marbles, seven white marbles, and five blue ...
Math - A bag contains 4 green marbles, 6 red marbles, and 2 white marbles. Three...

For Further Reading

First Name:
School Subject:
Answer: