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paint tray volume is approximately 220.5 cubic inches.   231 - 220.5 = 10.5   one gallon is more that the tray can handle.   therefore, the paint will overfill the tray by 10.53 cubic inches.

Another way to remove the denominator when they are all the same is to multiply each term in the equation by the common denominator, 13.  This has the same affect.   William (Bill) L

1/R = 1/R1 + 1/R2 (Rule for 2 parallel resistors) Subtract 1/R2 from both sides of the equation. 1/R – 1/R2 = 1/R1 Combine fractions on the left using the common denominator method. (R2 - R)/(R x R2) Therefore (R2 - R)/(R x R2) = 1/R1 Reciprocate both sides of the...