Question 666490
Establish variables
x = first day
y = second day
z = third day
...
Given
x = y+z
x = 4z
y = 4000+z
...
Set both x values as equivalent
y+z = 4z
Substitute the value of y
4000 + z + z = 4z
Isolate z
4000 = 4z - z - z
2z = 4000
Divide both sides by 2
z = {{{highlight_green(2000)}}}third day
...
x = 4(2000) = {{{highlight_green(8000)}}}first day
...
y = 4000 + 2000 = {{{highlight_green(6000)}}}second day
...
Check
x = 6000 + 2000 = 8000
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