Question

Karla's doctor recommended her daily caffeine intake stay under 400 milligrams. Today, Karla has already had 265 milligrams of caffeine. Her favorite soda contains 45 milligrams. Which of the following inequalities could be used to solve for x, the number of sodas Karla can still have today?
45x < 665
45x + 265 < 400
45x < 400
45x - 265 < 400

Answer 1

The answer would be; 45x - 265 < 400

because you need to now how much sodas can she still drink by subtracting the milligrams that she already had. (-265)

Answer 2

45x - 265 < 400 is your answer