When my grandfather died, he left his fine collection of coins, not more than 2500 of them, to his children, a different number to each of them, and in decreasing amounts according to their ages.
To the eldest of his children, he left one fifth of the coins, while the youngest inherited just one eleventh of them. Gaby, my mother (and third oldest of the children), received one tenth of the collection. All the other children received a prime number of coins.
How many coins did my aunt Isabel, second oldest in the family, inherit?