Question

For $9$ cows, $13kg500g$ of food supplements are required every day. In the same proportion, how much will be needed for $12$ cows?

Answer 1

Let us suppose $xkg$ of food supplement required for $12$ cows.

The quantity of food supplement and the number of cows vary in direct proportion.

$\therefore \frac{9}{13.5}=\frac{12}{x}$ [$\because 13kg500g=13.5kg$ ]

$\Rightarrow x=\frac{12\times 13.5}{9}$

$\Rightarrow x=18kg$

Hence, $18kg$ of food supplement required for $12$cows.