GRE Exam Numerical Ability Arithmetic

In the following correctly worked addition sum, A,B,C and D represent different digits, and all the digits in the sum are different. What is the sum of A,B,C and D?

5A
BC
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D43

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GRE Other Question

In a class of 62 students 41 are taking Spanish, 22 are taking Russian. Of the students taking Spanish or Russian, 10 are taking both courses. How many students are not enrolled in either course? If 0.25(x-y)= -2 and y²-x²=48, then sum of x and y is