book Maths Puzzle Numerical Ability

And last one for the day...

Evaluate:

4 -1 3
5 2 -4
3 -5 2

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book Other Question

Solve the problem: The printed matter on a 12 by 18 centimeter page of a book must cover 40 square centimeters. If all margins are to be the same width, how should the margin be? A HOT AIR BALLOON IS AT AN ALTITUDE OF M METERS. WRITE A WORD PHRASEFOR EACH EXPRESSION. M+34
M-2000
3M