F A box contains a number of tokens, of 4
different types. Each token is either blue or
white, and either round or square.
The ratio of blue to white tokens in the
box is 3:4.
The ratio of round blue tokens to square blue
tokens is 1 : 2.
The ratio of round white tokens to square
white tokens is 3 : 1.
What fraction of all the tokens are round?