Answer:
Answer below
Explanation:
Considering the information of the Adult T-shirt sizes, calculate the length of a large size T-shirt. using the small and the medium sizes to check your answer. 
a) medium size 
 30/20 = x/22
 x = 30x22/20
 x = 660/20
 x = 33 in 
b) small 
 27/18 = x/22
 x = 22x27/ 18
 x = 594/18
 x = 33 in
Both results are equal that mean that doesn't matter which measures are used to calcule the sizes of another T-shirt, There is proportion among them.