Question 1000037
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Let x = number of dimes.

Then the number of quarters is 2x. 

The balance equation is

2x*25 + 10x = 1920.

Simplify and solve it:

50x + 10x = 1920,

60x = 1920,

x = 1920/60 = 32.

Answer. Number of dimes is 32. 
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