Answer :
Answer:
Paul is 70 kg, John is 62 kg and David is 65 kg.
Step-by-step explanation:
Let x the mass for each person.
Paul = x
John is lighter than Paul, so John = x-8
David's mass is 5 kg less than John's, so David = x-5
Solution:
Make an equation.
x + (x-8) + (x-5) = 197
3x -13 = 197
3x = 197 + 13
3x= 210, then divide both side by 3, to get 70.
Do substitution to get a correct answer.
70+62+65= 197
197= 197
ok so we know Davids is 5 less than johns x-5
Johns is 8 lighter than paul x-8
combine x-5 +x-8 = 197
2x -13 = 197
2x = 210
x = 105
lets check it. (105-5 )+(105 -8) = 197
Johns is 8 lighter than paul x-8
combine x-5 +x-8 = 197
2x -13 = 197
2x = 210
x = 105
lets check it. (105-5 )+(105 -8) = 197
