SOLUTION: hI! please help me with this There are two jars each containing red and white marbles.The ratio of red to white marbles is 7:1 in the first jar and 9:1 in The second jar. There

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: hI! please help me with this There are two jars each containing red and white marbles.The ratio of red to white marbles is 7:1 in the first jar and 9:1 in The second jar. There      Log On


   

Question 111745: hI!
please help me with this
There are two jars each containing red and white marbles.The ratio of red to white marbles is 7:1 in the first jar and 9:1 in The second jar. There are 90 white marbles in the first jar. If the second jar has twice as many red marbles as the first jar how many white marbles are there in the second jar???
Thanks for any help comming on my way
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
7:1=x/90 cross multiply
x=630 red marbles in the first jar.
2*630=1260 red marbles in the second jar.
9:1=1260/x
9x=1260
x=1260/9
x=140 number of white marbles in the second jar.