Answer:
Richard is 22 and Teo is 9
Step-by-step explanation:
Teo's age:
31-13
=18 divided by 2
=9
Richard's age:
31-9
=22
1) 63
2) 49
3) 87
4) 44
C)
28 points
Step-by-step explanation
42=2x+x
42=3x
14=x
2x=28
32.08488741