Answer:
Batch 1:-  Red 2  ounces     Blue 1 1/2 ounces
Batch 2:-  Red 3     White  3 3/4 ounces.
Batch 3:- White  4 1/6      Blue  2 1/2 ounces.
Step-by-step explanation:
Batch 1
Amount of the white paint = 5/12 of the batch = 2 1/2  or 5/2 ounces.
5/12 is equivalent to 5/2 ounces of white paint.
1/12   ......................... 5/2 / 5 =  5/10 = 1/2 ounce.
Red paint.
!/3 of the  product contains red paint which is 4/12 so this is 4 times 1/12 = 4 * 1/2 ounce   = 2 ounces of red paint.
Blue paint.
Similarly to the above amount of blue paint =  1/4 =3/12
= 3 * 1/2 = 1 1/2 ounces of  blue paint.
Batch 2.
We can calculate the missing quantities in a similar way to Batch 1.
Blue Paint =  3/12 of the product  = 2 1/4 ( = 9/4) ounces  so
1 /12 = 
9/4 * 1/3 =  9/12 = 3/4 ounce
Red Paint:-  1/12 is equivalent to 3/4 ounce so 
Amount of red paint = 4 * 3/4 = 3 ounces  (answer)
White paint = 5 * 3/4 =  15/4 = 3 3/4 ounces (answer)
Batch 3.
Red paint = 3 1/3 ounces is equivalent to  4/12 of the product.
So 1/12 = 10/3  / 4 = 10/12 = 5/6 ounces.
White paint =  5/6 * 5 = 4 1/6 ounces.
Blue paint = 5/6 * 3 = 15/6 = 2 1/2  ounces.