Answer:
The number of textbooks of each type were sold is 134 math and 268 psychology books.
Step-by-step explanation:
Given:
Total number of math and psychology textbooks sold in a week is 402.
Now, let the number of math textbooks sold be [tex]x[/tex].
And, the number of psychology textbooks be [tex]2x[/tex].
According to question:
[tex]x+2x=402[/tex]
[tex]3x=402[/tex]
Dividing both sides by 3 we get:
[tex]x=134[/tex]
So, total number of math textbooks were 134 .
And, total number of psychology textbooks were [tex]2x=2\times 134[/tex]
[tex]=268[/tex].
Therefore, the number of textbooks of each type were sold is 134 math and 268 psychology books.
