Question

How many two digit numbers are divisible by 5?

• A. 15
• B. 17
• C. 20
• D. 18

Answer 1

Answer:

B. 17

$n=(a_n-a_1)/d+1$

$a_n=95,a_1=15,d=5$

$n=\frac{95-15}{5}+1$

$=80/5+1$

$=16+1=17$