Question 1134229
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Put the coins in groups of 1 25-cent coin, 2 10-cent coins, and 3 5-cent coins, according to the given ratio.  Each of those groups of coins is worth 1(25)+2(10)+3(5) = 25+20+15 = 60 cents.<br>
If the total value of the coins is $30 = 3000 cents, then the number of those groups of coins is 3000/60 = 50.<br>
So then the number of 5-cent coins is 3*50 = 150.