Sadie purchased 3 novels.
It is required to find how many novels did she purchase.
The branch of mathematics dealing with the properties and manipulation of numbers. a science that deals with the addition, subtraction, multiplication, and division of numbers. Fractions, decimals, percentages, fractions, square root, exponents, and other arithmetic operations are used to achieve mathematical simplifications.
Given that:
Let x represent number of novels and y represent number of magazines.
If Sadie purchased a total of 11 novels and magazines,
x + y = 11 ----- (i)
Each novel sells for $4 thus, if Sadie purchased x novels, she will spend $4x
Each magazines sells for $1, thus, if Sadie purchased y magazines, she will spend $1y or $y
The combined selling price for 11 novels and magazines is $20
4x + y = 20 ------- (ii)
from equation(i),
y = 11 - x -----(iii)
Substitute equation (iii) into equation (ii)
4x + 11 - x = 20
3x = 20 - 11
3x = 9
x = 9/3
x=3
Thus, Sadie purchased 3 novels.
Learn more about arithmetic here:
https://brainly.com/question/28272190
#SPJ2
