Answer:
80
Step-by-step explanation:
10+10= 20
20+20=40
40+40=80
The equation is 
Step-by-step explanation:
The bracket is denoted by the variable x.
The necklace is denoted by the variable y.
From given, Linda sells her bracket for $6.
Thus, the expression for bracket is
.
Also, Linda sells her necklace for $10.
Thus, the expression for necklace is
.
The equation for Linda sells her bracket and necklace is 
You do 9x27=243 then take 2x31=62 add 243+62=305 then take 305 and subtract it from 28 305-28=277
so if i did it right you should get n=277