cookbooks be x
travel books be y
(1)×2
Subtract (3) from (1)
Now
Answer:
2
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
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