SOLUTION: A jar is filled with $1 and $2 in the ratio 5 to 4. There are 30 $1 coins in the jar. How many coins are there in total?
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Question 1194190: A jar is filled with $1 and $2 in the ratio 5 to 4. There are 30 $1 coins in the jar. How many coins are there in total?
Answer by greenestamps(13198) (Show Source): You can put this solution on YOUR website!
Given the ratio 5:4, you can set up a proportion
to find the number of $2 coins.
If you solve that by the standard method seen in most textbooks, you would "cross multiply" to get
A less formal and much easier way to solve the proportion is simply to see that 30 is 6 times 5, so the number of $2 coins is 6 times 4, which is 24.
Finally, you could use formal algebra, starting with the given ratio 5:4
5x = # of $1 coins
4x = # of $2 coins
5x=30
x = 30/5 =6
4x = 4(6) = 24
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