Vintage Decimal Currency Ready Reckoner Book (Lot 50)
240 is divisible by 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 40, 48, 60, 80, 120, 240! Although I never really understood Guineas (21/-) or why people quoted them. The book cost 12 ½ p which was 2/6 in old money.