Jeremiah makes a recipe that calls for 1 and 1/2 cups of flour and 3/4 stick of butter if jeremiah uses 3 sticks of butter how many cups of flour will he need

We know that
the ratio of the recipe=(1 1/2)/(3/4)
1 1/2=1.5 cups of flour
3/4 stick of butter> 0.75 stick of butter
by proportion
1.5/0.75=x/3> 3*1.5=0.75*x
x=3*1.5/0.75> x=6 cups of flour

the answer is
6 cups of flour