At a certain coffee shop, all of the customers drink either coffee or tea, but not both. If 1/2 of the male customers and 2/5 of the female customers drink coffee, what is the ratio of the number of male to the number of female customers in the coffee shop?

(1) The number of female customers in the shop is one less than the number of male customers in the shop.
(2) In the coffee shop the number of male customers who drink coffee is equal to the number of female customers who drink tea.

[spoiler]OA=B[/spoiler]

Source: Princeton Review