MBA Exam

The sum of the first and second digits of a four digit number equals twice the sum of the other two digits.The sum of the first and fourth digits equals the sum of the second and third digits. The first and third digits have the maximum possible values that satisfy these conditions. Find the sum of 1st and 3rd digit.What can be the shortest method to solve this ? :/

1) 12
2) 13
3) 14
4) 15
5) none.

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MBA Other Question
I used 6 litres of oil paint to paint a map of India 6 meters high. How many litres of paint would I need to paint a proportionally scaled map 18 metres high?

1) 54
2) 18
3) 30
4) indeterminate
 Lines join centers of black squares on a chessboard. No lines pass through white squares, ................right angles are formed.

1) 128
2) 32
3) 64
4) 84