Please help, I struggle with word problems. Thank you.
There are 200 marbles in a box. All the marbles are either red or blue. If there are 40 more red marbles than blue, how many red marbles are in the box?
The correct answer is C. Let x be the number of blue marbles, and x + 40 be the number of blue marbles. There are 200 marbles in the box, so you have x+ x + 40 = 200, which is equivalent to 2x + 40 = 200, or x = 80.
