<PRE><B>Question 159355</B>
 I have twice as many nickels as quarters. If the coins are worth $4.90, how many quarters are there?
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N = 2Q  (twice as many nickels)
5N + 25Q = 490  (total worth)
Sub for N in the 2nd eqn
5*2Q + 25Q = 490
10Q + 25Q = 490
35Q = 490
Q = 14 (# of quarters)
N = 2Q = 28 (# of nickels)
Checking, it totals $4.90.
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