25 The library has an empty bookcase with 4 shelves. Each shelf can hold 23 chapter þooks. If the library has 117 new chapter books, how many will not fit on the bookcase?.

25 chapter books

Step-by-step explanation:

117 - (23×4)

[23×4=92]

.°. 117 - 92 = 25

Step-by-step explanation:

Total Shelf Capacity = Capacity per shelf x Number of Shelves

= 23 x 4

= 92

Number of new books to be fit in = 117

Amount of books Overflow = Number of books to be fit in - Total Shelf Capacity

= 117 - 92

= 25

Assuming the measurement is in degrees:

The sum of an angle and its complement is 90°.
Assign the variable x to the angle. Since it is 20° less than its complement, the angle's complement can be written as x+20°. 

With this information, an equation can be written:
x+x+20°=90°
2x+20°=90°
2x=70°
x=35

The measure of the angle is 35°.