# Water lilies

Water lilies are growing on the pond and their number is doubled every day. The whole layer is covered in 12 days. How many days will it cover 8 layers?

**Result****Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):**

**Showing 0 comments:**

**Be the first to comment!**

#### To solve this example are needed these knowledge from mathematics:

## Next similar examples:

- Sum-log

The sum of two numbers is 32, the sum of their logarithms (base 10) is 2.2. Determine these numbers. - The city 3

The city has 22,000 residents. How long it is expected to have 25,000 residents if the average annual population growth is 1.4%? - Theorem prove

We want to prove the sentense: If the natural number n is divisible by six, then n is divisible by three. From what assumption we started? - Unknown number

I think number. If subtract from the twelfth square the ninth square I get a number 27 times greater than the intended number. What is this unknown number? - Logarithm

Determine the number whose decimal logarithm is -3.8. - Exponential equation

Solve exponential equation (in real numbers): 9^{8x-2}=9 - Logarithmic equation

Solve equation: log_{33}(3x + 21) = 0 - Insert into GP

Between numbers 5 and 640 insert as many numbers to form geometric progression so sum of the numbers you entered will be 630. How many numbers you must insert? - Powers 3

2 to the power of n divided by 4 to the power of -3 equal 4. What is the vaule of n? - Intercept with axis

F(x)=log(x+4)-2, what is the x intercept - Radioactivity

After 548 hours decreases the activity of a radioactive substance to 1/9 of the initial value. What is the half-life of the substance? - Exponential equation

In the set R solve the equation: ? - Log

if ?, what is b? - Equation

How many real roots has equation ? ? - Exponential equation

Solve for x: (4^x):0,5=2/64. - Exp

If ?, then n is: - Novak

Novak needed to dig up three of the same pit in the garden. The first pit dug father alone for 15 hours. His second dig son helped him and it did that in six hours. The third pit dug son himself. How long it took him?