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5 December, 18:58

A group of scientist study the effect of chemical on Various strains of bacteria. Strain A started with 6000 cells and decreases at a constant rate of 2000 cells per hour after the chemical was applied. strain B started with 2000 cells and decreased at a constant rate of 1000 cells per hour after the chemical was applied. when will just strains have the same number of cells? explain

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  1. 5 December, 22:00
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    After h hours A has 6000 - 2000h cells and B has 2000 - 1000h. Equating them as one form:

    6000 - 2000h = 2000 - 1000h

    -2000h + 1000h = 2000 - 6000

    -1000h = - 4000

    h = - 4000/-1000 = 4 hours
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