If the positive integer x is a multiple of 4 and the positive integer y is a multiple of 5, then xy must be a multiple of which of the following?
I. 8
II. 12
III 18 Choose the correct choice from the following:	A) II only	B) I and II only	C) I and III only	D) II and III only	E) I, II and III
Ans E.   From question x/4 is an integer.   x/4 = 2*2*q/4 ---&gt; where q is the integer   Also y/6 = p =&gt; y/6 = 2*3*p/6   So, xy =  2*2*2= 
<gadget id="calculator"> 2*2*2</gadget>
<output>8</output>
8 and   2*3*2= 
<gadget id="calculator">  2*3*2</gadget>
<output>12</output>
12 satisfy   I, II and III
<result>E</result>
If the positive integer x is a multiple of 4 and the positive integer y is a multiple of 5, then xy must be a multiple of which of the following?
I. 8
II. 12
III 18