17,280 meal worms

c) 45 days

Your baby brother has an ear infection. The doctor said there are

probably 50,000,000 bacteria in his left ear. The penicillin the doctor

prescribed will kill 1/10 of the bacteria every 6 hours. How many bacteria

will be in your brother's ear in ...

Cremain)

a) 1 day

b) 5 days

c) 1 week

d) 3 hours

a) 30 000 000

b) - 100 000 000

c) - 160 000 000

d) 27 500 000

Step-by-step explanation:

You want to know how many bacteria are killed every 6 hours which is 1/10 so 50 000 000:10 = 5 000 000 every 6 hours.

a) how many times does 6 hours fit in 1 day) 24:6=4 so 4*5 000 000 = 20 000 000 so then you subtract that from 50 000 000 because you want to know what remains which means 30 000 000 bacteria remain.

b) we already calculated 1 day so 30 000 000*5=150 000 000. Then you subtract that from the 50 000 000. 50 000 000 - 150 000 000 = - 100 000 000

c) 1 day * 7 = 30 000 000*7 = 210 000 000 - 50 000 000 = - 160 000 000

d) 5 000 000:2 = 2 500 000 = 30 000 000 - 2 500 000 = 27 500 000 6 hours divided by 2 equals 3 hours so you also divide the bacteria by 2.