Answer:
3
Step-by-step explanation:
12*0.75=9
To find this do 9/12.
4*0.75=y
y=3
48
Sam had 36 books
Jim had 12
after same gave Jim 12 books, they each had 24 books
x/2 = 2x-3
x = 4x-6
3x = 6
x = 2
15+6=21
15-(-6) = 21