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If there were 4u 20-cents coins, there were 3u 50-cents coins and 2u $1 coins.

So in boxes, there were 4 boxes for 20-cents coins, 3 boxes for 50-cents coins and 2 boxes for $1 coins.

In values, 0.2* 4u + 0.5 * 3u + 1 * 2u = 64.5

0.8u + 1.5u + 2u = 64.5

4.3u = 64.5

u = 15

4u = 60

So there were 60 20-cents coins.

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