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a. The length is:

90 .1 / 3 = 30 (m)

The width is:

90: 2 - 30 = 15 (m)

b. Area is:

30. 15 = 450 (m2)

c. The width of the pond is:

15: 2 = 7.5 (m)

The length of the pond is:

30. 1/3 = 10 (m)

The perimeter of the pond is:

(10 + 7,5). 2 = 35 (m2)

We have :

ab + ba = 100

<=> 2.a.b = 100

<=> ab = 50

So ab = 50

1 x 2 x 3x 4 x 5 x 6 x 7 x 8 x 9 x 10

= (1 x 10) x (2 x 5) x 3 x 4 x 6 x 7 x 8 x 9

= 10 x 10 x 3 x 4 x 6 x 7 x 8 x 9

= 3628800

The volume of the smaller can is:

  (cm3)

The volume of the larger volume is:

 (cm3)

So the answer is:

Tell the praction to find is 

=> a + a = b - 1

=> a + 1 = b - a  = 8

=> a = 7

=> b = 15

So the fraction to find is 

Tell x is the number to find

=> x(x+2) = 783

=> x = 27 or x = -29

But x is a positive => x = 27

Tell the praction to find is $\frac{a}{b}$${\displaystyle \frac{\mathrm{<i><b>a</b></i>}}{\mathrm{<i><b>b</b></i>}}}$

$\Rightarrow \{\begin{array}{c}b-a=8\\ \frac{2a}{b-1}=1\end{array}$$<i><b>\Rightarrow </b></i><i><b>\{</b></i>\begin{array}{c}\mathrm{<i><b>b</b></i>}<i><b>-</b></i>\mathrm{<i><b>a</b></i>}<i><b>=</b></i>\mathrm{<i><b>8</b></i>}\\ {\displaystyle \frac{\mathrm{<i><b>2</b></i>}\mathrm{<i><b>a</b></i>}}{\mathrm{<i><b>b</b></i>}<i><b>-</b></i>\mathrm{<i><b>1</b></i>}}}<i><b>=</b></i>\mathrm{<i><b>1</b></i>}\end{array}$

=> a + a = b - 1

=> a + 1 = b - a  = 8

=> a = 7

=> b = 15

So the fraction to find is $\frac{7}{15}$

The answer is:

 $\frac{92.12+10.87}{12+10}=\frac{987}{11}\approx 89,$$72$

-5 ≤ 2x - 7 ≤ 21

=> 2 ≤ 2x ≤ 28

=> 1 ≤ x ≤ 14

So there are: 14 - 1 + 1 = 14 numbers is true

The area of the circle is:

The area of the square is:

So the answer is:

 (Condition ).

So x will satisfy 

The sum of 

Answer : - 30.

1800 = 23.32.52 = 1.1800 = 2.900 = 3.600 = 4.450 = 5.360 = 6.300 = 8.225 = 9.200 = 10.180 = 12.150 = 15.120 = 18.100 = 20.90 = 24.75 = 25.72 = 30.60 = 36.50 = 40.45         

So we have 36 numbers                                                                                 

1,2,3,4,5,6,8,9,10,12,15 is smaller or equal 15.

So we have 36 - 11 = 25 numbers left

Tell the books is a, the CD is b

=>  and a+b = $45

=> 3a + 8b = 2a + 10b

=> a = 2b

=> a+b = b+2b = 3b = 15

=> a = $15.2 = $30

=> 6a = 180

So the answer is $180

Call the percent increase is x (%)

Because the number of participants increase each year study.

We have equation : 

So 

Answer P = 60

The length of this rectange is:

The width of this rectange is:

24,8 : 4 = 6,2 [m]

So the area of this rectange is:

24,8 . 6,2 = 153,76 [m2]

Answer: 153,76m

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