Answer:
16 dimes and 1 nickel
23 nickel and 1 dime
These are just two you have so many options, just mess with it
10% means 10 out of 100.
So 10% of 120=

So total number of books now = 120+12 =
132
Hi!
To find the semmetry between the nonagon just do this:
360 / 9 = 40
The regular nonagon has rotational symmetry of 40 degrees!