exam Maths Puzzle Numerical Ability

9(b-4)-7b=5(3b-2)

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exam Other Question

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.
if i have three numbers and their sum is 181 and the value of the first number is twice that of the third number theirfore leaving the value of the second number as three times an