(X + Y) / 2 = 40

or, (X + Y) = 80

Again,

(Y + Z) / 2 = 35

or, (Y + Z) = 70

Now,

(X + Y) - (Y + Z) = 80 - 70

or, X - Z = 10

Discount amount = 30,00,000 - 27,90,000 tk

                           = 2,10,000 tk

Thus,

When original price is 30,00,000, discount is 2,10,000 tk

When original price is 100, discount is 2,10,000 * 100 / 30,00,000 tk

                                                          = 7 tk

Total savings in June = 100 + (100 * 10 / 100) tk = 110 tk

Total savings in July = 250 + (250 * 10 / 100) tk = 275 tk

Total savings in August = 130 + (130 * 10 / 100) tk = 143 tk

At the end of that time, she will have,

110 + 275 + 143 tk = 528 tk

If we let the side with length 9 as the largest side of the triangle, then 5 + x must be greater than 9 to form a triangle.

Thus,  5 + x > 9

or, x > 9 - 5

or, x > 4

If we let x be the largest side.

Then, x must be less than 5 + 9

So, x < 14

Thus, by combining it, we get,

4<x <14

The number is x.

One half of the number is x /2

So, (x / 2) + 4 = 14

or, (x / 2) = 14 - 4 = 10

or, x = 10 * 2 = 20

You have to go through the options here to find out the answer.

Option 1:

2*4 + 10 = 18

This is not greater than 18.

Option 2:

3*4 + 10 = 22

This is greater than 18 and less than 34.

Plus, this is the lowest integer that follows the given conditions.

   0.65

+ 0.15

+ 0.10

---------------

= 0.90

= 90 /100

= 9 / 10

The worst scenario would be that he has taken 4 blue and 4 green, total of 8 marbles, and still doesn't have 3 distinct colors. But the next draw (9th) will surely be the third color red as there is no other color marble left in pocket.

For April,

Cost of electric bill = (2800 * 0.30) tk

                             = 840 tk

For May,

Cost of electric bill = (3200 * 0.30) tk

                             = 960 tk

For June,

Cost of electric bill = (3600 * 0.30) tk

                             = 1080 tk

Total Cost of 3 Months = (840 + 960 + 1080) tk

                              &n 

24 buses = 36 cars

or, 1 bus = 36 / 24 cars = 3 /2 cars

Ferry is loaded with 18 buses. Ferry has free space in terms of buses = (24 - 18) buses

                                                          = 6 buses

Now,

1 bus = 3 /2 cars

6 buses = 3*6 / 2 cars

             = 18 / 2 cars = 9 cars

(xz)/y and (3xz)/(3y)  (3xz)/(3y)  = [(3)(xz)]/[(3)(y)]  = [(3)/(3)][(xz)/y]  

To change percent into fraction, take out the percent symbol and divide it by 100.  So,  0.5% becomes 0.5/100  Now, move the decimal place to the right in the numerator and the denominator until you have rid the fraction of decimals.  So,  0.5/100 becomes 5/1000  The number of times you move the decimal place in the numerator is equal to the number of zeros you add in the denominator.  Then reduce:  5/1000 = 1/200  (divide both numerator and denominator by common factor 5) 

Let us consider that she had x at the beginning.

She spent on books= x/3

Remainder after books purchase= (x - x/3)

She spent on clothing= (x - x/3) / 2

Remainder after cloth purchase = (x - x/3) / 2

She spent on food= 3[(x - x/3) / 2] / 4 = 3[(x - x/3) / 8] = (3x - x) / 8

                                                                             = 2x / 8