99. What is the greatest prime factor of 5,355?

A. 17

B. 51

C. 119

D. 131

E. 153

Hello,

5355 is divisble by 3 since 5+3+5+5=18 is divisible by 3

5355=3*1785

1785 is divisble by 3 since 1+7+8+5=21 is divisible by 3

1785=3*595

595 is not divisible by 3 but by 5

595=5*119

119 is divisible by 7 since 1*2+1*3+9*1=14 is divisible by 7.

119=7*17

17 is prime

Answer A