SOLUTION: Please help with a word problem. Translate the problem into a pair of linear equations in two variables. Solve the equations using either elimination or substitution, state your an

Question 281604: Please help with a word problem. Translate the problem into a pair of linear equations in two variables. Solve the equations using either elimination or substitution, state your answer for the specified variable.
A sum of money amounting to $3.80 consists of dimes and quarters. If there are 20 coins in all, how many are quarters?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
d+q=20 (1)
25q+10d=380 (2)
multiply the first by 10
10q+10d=200
subtract from second.
15q=180
q=180/15
q=12

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