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After exchange:

#50Cents : #1Dollar = 3 : 4

valueOf50Cents : valueOf1Dollars = 1.5 : 4 = 3 : 8 

Therefore, out of $75, 

valueOf50Cents = $75 ÷ (3+8) x 3 ~~~~~~~~~~~~~~

This question the ratio (3:4) is not realistic.

3:4 is 75%

If there are $20 from 50 cents, there will be $55 from $1. Then the number ratio is 40:55, which is around 72.73%.

However, if there are $21 from 50 cents, there will be $54 from $1. Then the number ratio is 42:54, which is around 77.78%.

What do you think? Please do reply me if I am missing anything. Many thanks.

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