Answer:
77 and 7
Step-by-step explanation:
Let the number of books sold by Jessica be A and Josh be B.
Cost of one book = $20
Jessica sold 11 times Josh .
That’s A = 11B
Together they sold 84 books.
That’s A + B = 84
We now have two equations ,
Equation 1 : A = 11B
Equation 2: A + B = 84
Substitute 11B for A in equation 2.
We have ,
11B + B = 84
12B = 84
Divide both sides by 12
B = 84/12
B = 7
Josh sold 7 books
Now substitute 7 for B in either of the equations to get A. Using equation 1 , we have
A = 11B
A = 11 x 7
A = 77
Jessica sold 77 books while Josh sold 7
Answer: Jessica sold 77 books. Josh sold 7 books.
Step-by-step explanation:
Let x represent the number of books that Jessica sold.
Let y represent the number of books that Josh sold.
Together they sold 84 books. This means that
x + y = 84- - - - - - - - - - - - - -1
Jessica sold 11 times more books than Josh. This means that
x = 11y
Substituting x = 11y into equation 1, it becomes
11y + y = 84
12y = 84
y = 84/12
y = 7
x = 11y = 11 × 7
x = 77
