exam Maths Puzzle Numerical Ability

log (x+10) - log (x+4) = log x

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exam Other Question

How many liters (L) of a 30% ACID SOLUTION MUST BE ADDED TO 8 L of an 55% acid solution to obtain a 40% solution? Divide.

(30b^3 + 3b^2 + 42b + 30) divided by (6b + 3)