4.2.31 Richard and Teo have a combined age of 42. Richard is 6 years older than twice Teo's age. How old are Richard and Teo? ​

15 (teo) , richard (27)

Step-by-step explanation:

richard= a  

teo= b

a+ b=42

b + 12= a

u can use substitution here  

(b+12) + b=42

2b+ 12= 42

2b=30

b= 15

to find a ( richard ) , you can use 15 + 12= 27

(a) the volume of the cone is 20/3 in3

hence, option a is correct.