1/4 of 1/2 of 1/5 of 200

"Of" means multiply...so we have

1/4 x 1/2 x 1/5 x 200  =

1/40 x 200 =5

$${\frac{{\mathtt{1}}}{{\mathtt{5}}}}{\mathtt{\,\times\,}}{\mathtt{200}} = {\frac{{\mathtt{40}}{\mathtt{\,\times\,}}{\mathtt{1}}}{{\mathtt{2}}}} = {\frac{{\mathtt{20}}{\mathtt{\,\times\,}}{\mathtt{1}}}{{\mathtt{4}}}} = {\mathtt{5}}$$

I hope I did that right...