Question

How many two digit numbers are divisible by 5?

• A. 15
• B. 17
• C. 20
• D. 18

Answer 1

Answer:

D. 18

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

$a_n=95,a_1=10,d=5$

$n=\frac{95-10}{5}+1$

$=85/5+1$

$=17+1=18$