First, we are going to find the one-fourth of the stamps that had snowflakes and snowmen as:
[tex]\frac{1}{4}\cdot(48)=\frac{48}{4}=12[/tex]So, there are 12 stamps with snowflakes and snowmen. It means that the number of stamps that had trucks and construction equipment are:
[tex]48-12=36[/tex]Answer: There are 36 stamps with trucks and construction equipment