34. How many five-digit numbers are divisible by 5?
34. Since the last digit can be chosen in only two ways (0 or 5), we will get a total of $9 \cdot 10 \cdot 10 \cdot 10 \cdot 2=18000$ required numbers. The same result can be obtained by dividing the total number of five-digit numbers by $5: 9 \cdot 10^{4}: 5=18000$.