<PRE><B>Question 1157918</B>
&lt;br&gt;
We are to determine the number of nickels.&lt;br&gt;
So start by seeing what the total value would be if all 50 coins were dimes: 50*10 = 500 cents or $5.00.&lt;br&gt;
That is $1.10 too much, or 110 cents too much.&lt;br&gt;
So imagine replacing dimes with nickels until you get the correct total of $3.90.&lt;br&gt;
Each time you exchange a dime for a nickel, the total value decreases by 5 cents.&lt;br&gt;
The number of times you need to do that to reduce the total by 110 cents is 110/5 = 22.&lt;br&gt;
You replaced 22 of the dimes with nickels to get the correct total of $3.90.&lt;br&gt;
ANSWER: 22 nickels.&lt;br&gt;
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