Question 1205955
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Let's see why they can't all be nickels.

If all 37 coins were nickels there would be $1.85. So the extra 30 cents must be
2 parts pennies to 1 part dimes or 20 pennies and 10 dimes making 30 coins that
we must reduce the 37 nickels by, so 7 nickels remain.

Edwin</pre>