Question

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?​

Answer 1

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.