self Maths Puzzle

If (7+4a) & (5+2b) are the digits in the thousands & tens places respectively of the number 98537, then find the value of a & b?

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self Other Question

There are 3 grooms A,B and C and one bride X. From X's point of view, she can marry A, B or C. So probability of her marrying A is 1/3. From A's point of view, either X is going to marry her or not. So probability of A getting married to X is 1/2. Then which is the correct answer? the pointa A(2,-1,3), B(4,1,0) and G(-3,2,-1) from the vertices of a triangle.D is the mid-point of BC. determine the angle between AD and BC ?