Martas math textbook weighs 4/5 of a pound less than 4 times the weight of the book she is reading for her languages arts class. If the weight of the math textbook is 2 1/5,

The answer is , x = 3/4 pound.

Let m be the weight of math textbook.
Let x be the weight of language arts class.
Math textbook weighs 4/5 of a pound less than 4 times the weight of the book for language arts class:
m = 4x - 4/5

Since , then:

The answer is 2 1/5 = 4x - 4/5, x = 3/4 The answer is pound .