exam Maths Puzzle Numerical Ability

Factor a^2(b-c)-16b^2(b-c)

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A BACTERIA CULTURE STARTED WITH A COUNT OF 480 AT 8:00 A.M. AND AFTER t HOURS IS EXPECTED TO GROW TO f(t)=480(3/2)t. ESTIMATE THE NUMBER OF BACTERIA IN THE CULTURE AT NOON THE SAME DAYS. what is the inequality of 9m+8>0