book Maths Puzzle Numerical Ability

Frederique is two years older than her brother. Twelve years ago she was twice as old as he was. How old are they now?

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book Other Question

manager of a furniture factory finds that it cost $2200 to manufacture 100 chairs in 1 day, and $4800 to produce 300 chairs in one day. assuming that the relationship between cost 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?