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polet [3.4K]
4 years ago
9

The average marks obtain by three students is 15.if 2 students obtain 12 and 18 Marks respectively find the marks obtained by th

e third student.​
Mathematics
1 answer:
satela [25.4K]4 years ago
5 0

Answer: 15

Step-by-step explanation:

Average is sum of scores/ number of scores, from the question, average is given as 15.

Let the missing score be x

Equation for the questionis represented as: 12 + 18 + x /3 = 15

30 + x /3 = 15

Cross multiply

30 + x = 15×3

30 + x = 45

Subtract 30 from both sides

30 + x -30 = 45 -30

x = 15.

Check:

12 + 18 + 15/3 = 15

45/3 = 15

I hope this is clear, please mark as brainliest answer

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What is 100×100 and 100÷100​
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3 years ago
Three years ago, Jolene bought $550 worth of stock in a software company. Since then the value of her purchase has been increasi
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Answer:

Hence the the value of stock after three years worth $734.44  

Step-by-step explanation:

According to question ,

Jolene bought three years ago, stock in a company worth = $550

The value has been increase after three year at rate of = 10.12 %

So,

The value after three years can be written as

Final value = initial value ( 1 +\frac{Rate}{100})^{Time}

Or, Final value = $550 ( 1 +\frac{10.12}{100})^{3}

Or, Final value = $550 (1.102)³

Or, Final value = $550 × 1335

I.e final value = $734.44

Hence the the value of stock after three years worth $734.44  Answer

4 0
3 years ago
Sabiendo que cada persona unos 4 500 000 glóbulos rojos por milímetro cúbico y que su cantidad de sangre es de 5 litros A) Que l
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Answer:

Part A) distance covered by the aligned red cells is: 180000 Km

Part B) 8000000 bacteria (8 million bacteria)

Step-by-step explanation:

Part A)

Let's first find the total number of red cells that the person has in the 5 liters, knowing that there are 4,500,000 of them in a cubic millimetre:

Since 1 liter contains 1,000,000 cubic millimetres, then, in 5 liters there must be 5 times that number of cubic millimetres. That is a total of 5,000,000 cubic millimetres.

Since in each cubic millimetre there are 4,500,000 red cells, then the number of red cells in the 5 liters must be the product of these two quantities:

4,500,000 x 5,000,000 = 22,500,000,000,000 red blood cells.

Now, to find the distance they will cover aligned one after the other, knowing that their average diameter is 0.008 mm is:

22,500,000,000,000 x 0.008 mm= 180000000000 mm

22.5\,\,10^{12} * 8\,\,10^{-3}=1.8\,\,10^{11} mm

In order to convert this distance into Km as requested, we use the fact that 1 mm = 0.000001 Km, or using exponents in base ten:

1 mm = 10^{-6}\,\,Km

Then, the distance covered in kilometers is:

1.8\,\,10^{11}\,*\,10^{-6} \,\,Km=1.8\,\,10^{5}\,\,Km=180000\,\,Km

Part B)

The vaccine contains a total of  10^8  bacteria per cm^3

In order to find how many bacteria we have in 80 mm^3 of the vaccine, we first need to convert 80 mm^3  into cm^3:  

80\,\, mm^3 = 0.08 \,\,cm^3

Then, if in one cm^3 there is 10^8  bacteria, in 0.08\,\,cm^3 there would be: 0.08\,*\,10^8 bacteria. That is: 8\,\,10^6 bacteria = 8000000 bacteria (eight million bacteria)

8 0
3 years ago
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