Question

Complete the following activity to find the number of natural numbers between 1 and 171, which are divisible by 5:  

Activity : 

Answer 1

a = 5 , d = 10 - 5 = 5 , t_n = 170

t_n = a + (n - 1)d

170 = 5 + (n - 1) × 5

170 = 5 + 5n - 5

170 = 5n

n = 34