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
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