Carter has 60 balloons. 412 of the balloons are black, and 312 of the balloons are white. The rest of the balloons are red. Which series of calculations shows how many red balloons Carter has?
12/12= 3 × 4/12; 1/12 × 60 = 5; 4 × 5 = 20 red balloons
4/12+ 3/12 = 7/12; 1/12 × 60 = 5; 7 × 5 = 35 red balloons
12/12– 4/12 – 3/12 = 5/12; 1/12 × 60 = 6; 6 × 5 = 30 red balloons
4/12+ 3/12 = 7/12; 12/12 – 7/12 = 5/12; 1/12 × 60 = 5; 5 × 5 = 25 red balloons