book Maths Puzzle Numerical Ability

3a - 4 7 - 2a
5 - ______ = _______
5 2

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book Other Question

What is the difference in elevation between the higest point in California,Mount Whitney,which towers ,4421 meters above sea level,and the lowest point in Califorina,Death Valley,w x2 +4x-12 x 8x2 - 18
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4x-6 5x+30