How many integers n satisfy 0 < n < 60 and 4n ≡ 2 mod 6?
2 mod 6 = 2
We are looking for integers n such that 4n mod 6 = 2
n = 2 5 8 11 14 17 20 23 26 29 32 35 38 41 44 47 50 53 56 59
20 integers