I predict this will be about working out what the letters stand for in numbers.
Nothing to clarify.
The question is asking what the letters A, B, C and D represent in numbers to add to the answer 2968.
The way you get the answer is by using the right tools to get the answer. The three D’s need to add up to 8 and you add three six’s which is 18 and you carry the 1 to the next column to add to that to. Then you work out what the three C’s are the they are 5’s. You add them together to get 15 and add the 1 to make 16 and you carry the 1 again. Then you add the 1 to the next two numbers which are 4’s. You add them together to get 8 and then add 1 again to get 9. Then finally you work out what A is and it in 2 and then you have your answer.