Answer:
Richard: 35 years old
Teo: 10 years old
Explanation:
Let the ages of Richard and Teo be R and T years old respectively.
R +T= 45 -----(1)
R= 2T +15 -----(2)
Substitute (2) into (1):
2T +15 +T= 45
3T +15= 45
3T= 45 -15 (-15 on both sides)
3T= 30
T= 30 ÷3
T= 10
Substitute T= 10 into (2):
R= 2(10) +15
R= 20 +15
R= 35
Thus, Richard is 35 years old and Teo is 10 years old.