Can you halp me pls it really hard pls pls pls me

1. 1 1/4 + 1 3/4 = p (purple paint)
    estimate : 1 + 2 = 3
    actual answer : 1 1/4 + 1 3/4 = 3 gallons

2. 4 - 1 1/2 = r (ribbon left over)
     estimate : 4 - 2 = 2
     actual answer : 4 - 1 1/2 = 2.5 ft

3. 1 2/3 + 1 2/3 = c (cups of shredded cheese)
     estimate : 2 + 2 = 4
     actual answer : 1 2/3 + 1 2/3 = 2 4/3 = 3 1/3 cups

Bruh sound effect #2

If i think this is what your asking, he should look at the grams or pounds/ounces and compare the to their cost then max can identify which one is proportional and which is not ( i think xd)