The houses on fifth Street or number from 28 to 91. how many house numbers contain at least a 3 address in their address?
To count the house numbers that contain at least a 3 in their address, we can use the complement rule. That is, we first count the house numbers that do not contain 3, then subtract this number from the total number of houses to get the answer.
The house numbers on fifth Street range from 28 to 91, inclusive. To count the house numbers that do not contain 3, we can count the numbers that contain only 0, 1, 2, 4, 5, 6, 7, 8, and 9 in the tens and units digit. There are 9 choices for each of the tens and units digit, so there are 9x9=81 such house numbers.
Therefore, the number of house numbers that contain at least a 3 is:
Total number of houses - Number of houses that do not contain 3
= 91 - 81
= 10
So there are 10 house numbers on fifth Street that contain at least a 3 in their address.