Question 702222
This will get you started.

Note that 1 u.s. pint is equal to one-eighth of a u.s. gallon, 
and 1 pint is 16 fluid ounces.


let x be pints of 1% fat milk, and let y be pints of 4% fat milk.

Wanted is (1/3) pint of milk mixture.  {{{x+y=(1/3).}}}


Fat quantity:  0.01x+0.04y= amount of fat.


{{{(0.01*x+0.04*y)/(1/3)=0.02}}}    because you wanted 2% fat in the portion of milk to use for the latte.