Birthday Maths Test This greetings card measures 15.5cm x 15.5cm and features a funny image of a sheep mixing drinks. The front of the card reads : If we pour 1/2 a 75cl bottle of wine into a measuring jug then add a 1/4 bottle of gin and subtract 2 glasses from it, what do we have?... The inside of the card reads: Correct! A bloody good time! Happy Birthday Paperlink Paperlink are one of the greeting cards industries market leader of contemporary and humerous cards. Founded in 1985 the Paperlink collection has grown for all occasions, with beautiful imagery or funny cartoons there is a card for everyone!