The question wants the "lowest common multiple" of 6 and 9, so first, lets find some of the miltiples of 6 and 9:
[tex]\text{Multiple}(6)=\mleft\lbrace6,12,18,24,30,36,42,49,\ldots\mright\rbrace[/tex][tex]\text{Multiple}(9)=\mleft\lbrace9,18,27,36,45,54,\ldots\mright\rbrace[/tex]We can see that 18 is a commom multiple of 6 and 9, and is also the smallest, so the lowest common multiple of 6 and 9 is 18. So the least number of gift bags and bows that Rachel can buy is 18.
