Calculate how many mg is lethal to resident arnold who weighs 45 kg and resident harold who weighs 96 kg. the ld50 of lead is 450 mg/kg

To get the answer, use the value that has two units because that's your conversion factor (what is used to convert).

conversion factor--> 450 mg/Kg
this value tells us that 450 mg= 1 Kg
use it so the units cancel (what you converting from in the denominator, Kg, what you converting to in the numerator, mg)

Arnold

45 Kg x (450 mg/ 1 kg)= 20250 mg

Harold

96 Kg (450 mg/ 1 Kg)= 43200 mg

Ais the correct answer

You can still be friends with each other. you don't have to date since he likes someone else. just stick to being friends for now