Answer 1

`2/9, 2/3,8/21`

Changing them to like fractions, we obtain

`2/9 = (2 xx7)/(9 xx 7) = 14/63`

`2/3  = (2 xx 21)/(3 xx 21) = 42/63`

`8/21 = (8 xx 3)/(21 xx 3) = 24/63`

Since 42>24>14,

`:. 2/3 >  8/21 > 2/9`