# john wants to send a letter to peter

questioned by maham237 @ in Mathematics viewed by 6131 People

John wants to send a letter to Peter, who lives on Tesla

Street. John doesn't remember the house number.

However, he knows that it has 4 digits, it is a multiple of 5

and 7 and that the last digit is 0. What is the minimum number

of letters that John has to send to be sure that Peter receives his letter?