SOLUTION: A bag contains 5ps coins, 10ps coins and 20ps coins in the ratio of 1:2:4. If their total money in the bag is Rs. 84 .Find the number of 10ps coins in that bag?

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Question 1074594: A bag contains 5ps coins, 10ps coins and 20ps coins in the ratio of 1:2:4. If their total money in the bag is Rs. 84 .Find the number of 10ps coins in that bag?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
There are x 5p coins, 2x 10p coins, and 4x 20p coins.
x%285%29%2B2x%2810%29%2B4x%2820%29=8400
5x%2B20x%2B80x=8400
105x=8400
x=80
So the number of 10p coins is 2x,
N%5B10p%5D=2%2880%29
N%5B10p%5D=160