Lucy and Mia read 9 books in week. Mia read twice as many ad Lucy. How many books did Mia read?​

Mia read 6 books

Step-by-step explanation:

Let,  L= number of books that Lucy read

and M= number of books that Mia read.

Given:

Lucy and Mia read 9 books in week.

L+M = 9

Mia read twice as many ad Lucy.

M = 2L or L=M/2

How many books did Mia read?​

M?

Substitute L with M/2 in the equation L+M =9

M/2 +M =9 , find the common denominator

(M+2M)/2  =9, multiply both sides by 2, and add like terms in parenthesis

3M = 18, divide both sides by 3

M = 6 books

18

Step-by-step explanation:

9×2(twice as many)

=18

answer: 4 (:

step-by-step explanation: