There are 100 calories in 8 fluid Ounces of orange juice and 140 calories in 8 fluid Ounces of pineapple juice. Tia mixed 4 fluid Ounces of each juice. Complete and solve the equation to find the number of calories in each fluid Ounce of Tia's juice mixture. 140 = 8x 2 X= There are calories in each fluid ounce of Tia's juice mixture.​