A textbook store sold a combined total of 236 biology and sociology textbooks in a week. The number of biology textbooks sold was three times the number of sociology textbooks sold. How many textbooks of each type were sold?

The number of sociology books is 59 and the number of biology books is 177.

Step-by-step explanation:

Given,

The number of biology textbooks sold was three times the number of sociology textbooks.

Total number of books = 236

To find the number of each types of books.

Let,

The number of sociology books = x

The number of biology books = 3x

According to the problem,

3x+x = 236

or, 4x = 236

or, x =

or, x = 59

Hence,

The number of sociology books = 59

The number of biology books =3×59 = 177

practice. practice. practice.

answer:   x = 3 + √11     and     x = 3 - √11

step-by-step explanation:

x² - 6x + 9 = 11

(x - 3)² = 11

x - 3 = ±√11

    x = 3 ± √11

x = 3 + √11     and     x = 3 - √11