Which of the following expressions simplifies to 0?

1.67 gallons

Step-by-step explanation:

Question is:

How much extra-virgin oil, containing 0.8% acidity, must be added to 4 gallons of olive oil with an acidity of 2.5% so that the mixture has an acidity of 2%? Solution must be in gallons, rounded to nearest hundredth place

Let the added amount be x, then acid content is:

0.008x + 4*0.025 = (4 + x)*0.020.008x + 0.1 = 0.08 + 0.02x0.02x - 0.008x = 0.1 - 0.080.012x = 0.02x = 0.02/0.012x = 1.67 (rounded)

1.67 gallons of virgin oil to be added