Question
A coin bank contains some twenty-cent and fifty-cent coins in the ratio of 5 : 4.
When 10 fifty-cent coins are taken out and
exchanged with some twenty-cent coins of the same value,
the ratio became 10 : 7.
Find the sum of money in the coin box in dollars.
3 m

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A coin bank contains some twenty-cent and fifty-cent coins in the ratio of 5 : 4.
When 10 fifty-cent coins are taken out and
exchanged with some twenty-cent coins of the same value,
the ratio became 10 : 7.
Find the sum of money in the coin box in dollars.