Part A
we know that
for make 100 bracelets.--------------------> Malcom has 125 feet of yarn
for make 1 bracelets.----------------------------> x
x=125/100--------------> expression that will find the amount of yarn Malcolm uses to make one bracelets
part B
x=125/100=1.25
the answer part B is 1.25 ft of yarn to make 1 bracelets