There are 4 quarts in a gallon
Set up the proportion
x/4 = 5/2
Hello!
The angle is a right angle, which measures 90°.
3x + x = 4x
Angle = 4x + 10 = 90
Switch that around
90 - 10 = 4x
90 - 10 = 80
80 = 4x
Divide by 4

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I really don’t know but maybe this will help you now and later