book Maths Puzzle Numerical Ability

Solve for x:

1 1 22
�� + �� = ��
x - 4 x + 4 x� - 16</PRE>

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book Other Question

How can you detrmine whether a system has no soltion by graphing? James' average driving speed is 22 kilometers per hour faster that Lars'. In the same length of time it takes James to drive 616 kilometers, Lars drives only 462 kilometers. What