exam Maths Puzzle Numerical Ability

x-8/x+5 / x-9/x+4 << considering the following

Explain why -5, 9, and -4 are not allowable replacements for the variable x.

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exam Other Question

How can you tell what a negative slope is and a positive sole is? X baskets of strawberries were put on sale on Monday. The unsold baskets of any day were put on sale the next day. 1/3 of the baskets were sold on Monday. 2/3 of those put on sale on Tuesday were unsold. 8 baskets were put on sale on Wednesday. What is X?