Astone 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?
show your work.
what is the person’s weight in kilograms?

We should use lb to convert weight to kg

let unknown lb be = X
14 lb = 1 stone
X lb = 9 stone
Cross multiply : X × 1 = 9 × 14
X = 126 / 1 = 126 lb

9 stone = 126 lb
let unknown value of kg be = Y
2.2 lb = 1kg
126 lb = Y kg
Cross multiply : 2.2 × Y = 126 × 1
Y = 126 / 2.2 = 57.3 kg

So 9 stone = 126 lb = 57.3 kg

HOPE IT HELPED !!