Two numbers are in the ratio 8 : 3.

Let the numbers be $8 \mathrm{x}$ and $3 \mathrm{x}$.

$8 x+3 x=143$

$\Rightarrow 11 x=143$

$\Rightarrow x=\frac{143}{11}$

$\Rightarrow x=13$

$\therefore O$ ne number $=8 x=8 \times 13=104$

Other number $=3 x=3 \times 13=39$