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3 years ago

After a 15% increase, a town has 115 people. What was the population before the increase?

Mathematics

1 answer:

Arte-miy333 [17]3 years ago

7 0

Answer:

100 people

Step-by-step explanation:

Population Of People=115Percentagencrease=15%

The New Population corresponds to 115%

(That is 100+15)

We want to find the population that corresponds to 100% that is the original population.

Therefore Original Population;

 $\frac{100}{115}\times {115}{}$ 

 $100 \: people$ 

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Answer:

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4 years ago

How to convert 108 km/ h to m/seconds? Please show the steps.

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3 years ago

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An experimental population of fruit flies increases according to the law of exponential growth. There were 60 flies after the 2n

Mice21 [21]

Answer:

There were 10 flies originally

Step-by-step explanation:

Since we have an exponential growth, we will be having a constant percentage of increase and we can set up the increase at any day using the following equation;

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where V is the number of flies on a particular day

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r is the constant increase in percentage

and d is the number of days.

So we have for the second day;

60 = I(1+r)^2 ••••••(i)

For the fourth day, we have;

360 = I(1+r)^4 ••••••••(ii)

divide equation ii by i; we have;

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(√6)^2 = (1+r)^2

1 + r = √6

r = √6 - 1

So we can substitute the value of r in any of the equations to get I which is the initial number of flies

Let’s use equation 1

60 = I(1 + r)^2

60 = I(1 + √6 -1)^2

60 = I(√6)^2

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3 years ago

In a school there are 542 girls and boys. how many pupils are there in that school?

DaniilM [7]

Answer:

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2 years ago

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