Which of the following must be an integer if the integer x is divisible by both 15 and 21? Select:  A) x/252  B) x/189  C) x/126  D) x/105  E) x/81
the integer has to be multiple of LCM of 15 and 21, which is 105..   so x/105 will be an integer   ans x/105
<result>D</result>
Which of the following must be an integer if the integer x is divisible by both 15 and 21?