Question

A textbook store sold a combined total of 204 math and psychology textbooks in a week. The number of math textbooks sold was three times the number of psychology textbooks sold. How many textbooks of each type were sold?​

Answer 1

Answer:

Math: 153 Psychology:51

Step-by-step explanation:

If you divide 204 by 4, You'll get 51.

Then, Take 51 and multiple it by 3, You should get 153.

Then add 51 to 153. (153+51=204)

Hope this helps

Answer 2

51 psychology textbooks
153 math textbooks

Let’s let x equal the number of psychology textbooks sold. That means that the number of math textbooks sold would be 3x (3 times x, or the number of psychology textbooks). Knowing the total is 204, we can make an equation that says x (the number of psychology textbooks) plus 3x (the number of math textbooks) equals 204 (the total number of textbooks). We can then combine x plus 3x to make 4x. So we’re left with 4x equals 204. If we divide both sides of the equation by 4 we’re left with x equals 51. So 51 psychology textbooks were sold. We then multiply this number by three to get 153, the number of math textbooks sold.

Let x = number of psychology textbooks
So 3x = number of math textbooks
x + 3x = 204
4x = 204
x = 51 3x = 3(51) = 153