Answer:
After their weight change Alberto's mass is 54.2 kg and Frank's mass is 45.8 kg
Step-by-step explanation:
step 1
Find Alberto's mass after the change
Adds the kilograms he gains to its original mass
52.2+2=54.2 kg
step 2
Find Frank's mass after the change
Subtract the kilograms he losses from its original mass
48.8-3=45.8 kg
therefore
After their weight change Alberto's mass is 54.2 kg and Frank's mass is 45.8 kg
