Question

A stone is an English measure of weight. There are 14 lb in 1 stone and 2.2 lb in 1 kg. A certain person weighs 9 stone. If you wanted to convert the person’s weight to kilograms, what conversion factor should you use?

Please and thank you.

Answer 1

Here, 14 lb = 1 stone
1 lb = 1/14 stone

2.2 lb = 1 Kg
1 lb = 1/2.2 Kg

Compare both equations,

1/14 stones = 1/2.2 Kg
1 stone = 14/2.2 Kg
1 stone = 6.36 Kg [ It's Our Factor ]

Now, person weighs 9 stone would be: 6.36 * 9 = 57.27 Kg

Hope this helps!