Question

if 45 iron rods of the same size we 12.6 kg how much is the weight of 24 such roads

Answer 1

The answer is the solution to this equation:
24/45*12.6
The ratio of the number of rods times the weight of the 45 rods

Answer 2

Weight of 45 iron rods = 12.6 kg
Weight of 1 iron rod = 12.6/45
Weight of 24 iron rods = 12.6/45×24
=6.72 kg