T+6=24. The value the bakes the equation true is 18. To find this, you would subtract 6 from 24, which would be 18. If you add 6 marbles to 18 marbles, that would be 24, therefor, Tim would have 18 marbles, making Nirja have 24 marbles. I'm 100% this is true. Hope this helps! Please mark brainiest! :)