Question

Alex has three times as much money as Jennifer. Jennifer has $12 less than Shannon. Together they have $91. How much money does Alex have?

Answer 1

Alex has $47.4

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