Tina makes 480 sandwiches.
She only makes tuna sandwiches, beef sandwiches, ham sandwiches and
cheese sandwiches.
of the sandwiches are tuna. 35% of the sandwiches are beef.
The ratio of the number of ham sandwiches to the
number of cheese sandwiches is 5:6
Work out the number of ham sandwiches that Tina makes.