Optimal consumtion bundle of lemons and sugar
Alex's preferences of sugar and lemons can be expressed in form of a utility function as:

$U(x,y)=min(x/2,y) $

where $x$ is sugar and $y$ is lemons.This function tells us we need at least 2 spoons of sugar to consume 1 lemon.

we need a minimum of 2 sugars initally so we can say $x=2$ for 1 lemon so $y=1$

Plugging those values into our  budget constraint:

$44=20x+y$ 

$44=20(2)+(1)$

$44&gt;41$

Notice how we end up having 3 left over, however with the budget constraint and preferences provided our consumption bundle will be 2 sugars and 1 lemon.