Answer:
let the daughter age be x
let mother age be 3x
Step-by-step explanation:
x+3x= 80
4x = 80
x= 80\4
x=20
daughter age is 20
mather age= 80 -20
= 60
daughter age 20
mother age 60
X=2
I have an image showing all work
You have to set up a ratio and solve
Answer: 40 books
Step-by-step explanation: 20%=8 Books
100 divided by 20 = 5
8 x 5 = 40
