Question 668829
Establish variables
x = $8 chime
y = $20 chime
...
Given
x+y = 30
8x+20y=492
...
8(30-y) + 20y = 492
240 - 8y + 20y = 492
12y = 252
{{{highlight_green(y = 21)}}} $20 chimes
...
x = 30 - 21 = {{{highlight_green(x = 9)}}} $8 chimes
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