Joanie's bag of trail mix has a mass of 0.75 kilogram. she and so me friends eat 0.5 kilogram of the mix. how many kilograms of trail mix are left draw a nip umber line to solve

For this case, the first thing to do is subtract both values.
 We have then:
 Joanie's bag of trail mix = 0.75 kilogram
 She and some friends eat = 0.5 kilogram
 Subtracting we have:
 0.75 - 0.5 = 0.25 Kilogram
 number line all:
 0 --- 0.25 --- 0.5 --- 0.75
 number line when they ate trail mix:
 / 0 / --- /0.25/ --- /0.5/ --- 0.75
 Remaining amount
 0.25 kilograms
 
 0.25 kilograms of trail mix are left

Ithink it’s b because it say 3 plastic rings and all the balls