Answer:
Not much sure if this is a joke but 1+1 is 2 not 11.
Step-by-step explanation:
I hope I helped.
Have a great day ;)

Thickness of the book is ~
Refer to the attachment for solution ~
Using cross multiplication you can determine that the ANSWER is 10.
Answer:
12 different combinations.
Step-by-step explanation:
There are two different ways you can do it. Using One of your balloons and counting from the three balloons. And do it until 3 are all used. Which is 12. This may not help because I am having trouble explaining it. If you already understand or don't wanna, you can just do, 4 balloons multiplied by 3 ribbons. And we get 12 again. I hope this helps!