Respuesta :
Answer:
2
Step-by-step explanation:
$52 7books $6 CB which means she brought 2 which is $12$8 TB and then 7-2 because he already brought 2 CB so that means that he brought 5TB which is 40 Then add 40 +12 = $52 for 7 books
cookbooks be x
travel books be y
- x+y=31--(1)
- 2x+5y=107--(2)
(1)×2
- 2x+2y=62--(3)
Subtract (3) from (1)
- 3y=45
- y=15
Now
- x=31-15
- x=16