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31 August, 02:50

Bacteria X has a growth rate of 160 % per hour. Some amount of bacteria X are accidentally introduced into some egg salad. Two hours after contamination, there were 45,000 bacteria X in the egg salad.

Find the initial number of bacteria X introduced into the egg salad:

Estimate the number of bacteria in the food 3 hours after contamination.

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  1. 31 August, 04:38
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    Answer: initial number: 17,773

    3 hours after contamination: 72,798

    Step-by-step explanation:

    We know that the growth rate is 160% (or 1.6 in decimal form)

    This means that if we start with a quantity A initially, after one hour we will have a quantity A*1.6 of bacteria.

    After another hour, we will have a quantity (A*1.6) * 1.6 = A*1.6^2 of bacteria.

    Then we can model this with an exponential equation:

    B (t) = A*1.6^t

    where t is the time in hours.

    We know that when t = 2, we have:

    45,000 = A*1.6^2

    Here we can solve it for A, which is the initial number of bacteria X.

    A = 45,500 / (1.6^2) = 17,773,4

    That we can round down, because we need whole numbers, so the initial number of bacteria X in the egg salad is A = 17,773

    If we want to find the number of bacteria 3 hours after the contamination, we need to use t = 3.

    B (t) = 17,773*1.6^t

    B (3) = 17,773*1.6^3 = 72,798.2

    That again, we need to round to the next whole number, so we round down.

    B (3) = 72,798
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