Answer:
Alex has $47.4
Step-by-step explanation:
Let a=alex, j=jennifer, and s=shannon.
a=3j
j=s-12
j+s+a=91
Substitute s-12 for j in the first equation to get a=3(s-12). Now substitute this equation and the second into the third.
s-12+3(s-12)+s=91
Simplify to get 5s-48=91
s=27.8 Substitute this into a=3(s-12) to get a=47.4
