Mr. Fazle Kabir has joined as the 11th Governor of Bangladesh Bank on 20 March, 2016.

Let purchase price of the watch be= x

Then, at 15% loss, the selling price is= (1- 0.15)x = 0.85x

And, at 10% profit, the selling price is= (1+0.10)x = 1.10x

Difference between two selling price = 110x - 85x = 0.25x

A/Q,

0.25x = 8

or, x = 8/0.25 = 32

11:40 AM to `12:20 PM is 40 minutes. As, After 11:59 AM, it becomes 12:00 PM.

Now,

An Hour is 60 minutes.

40 minutes is 40/60 parts of 60 minutes.

                  = 4/6 parts

                  = 2/3 parts

A = (4/6) * B

and, B = (6/8) * C

Now,

A = (4/6) * (6/8) * C

or, A = (4*6/6*8) * C

or, A = (4/8) * C

or, A = (1/2) * C

or, A/C = 1/2

or, C/A = 2/1

Let total profit be 100,

Then, A gets 40,

B gets 25,

Percentage of A's profit of that of B is = 40*100/25

                                                        = 160%

The twist is that, the question specifically asks you to divide the number by half (1/2), not by two (2).

Thus, dividing 60 by half means,

60 / (1/2) = 60*2/1 = 120

And deducting 20 from the derived value = 120 - 20 = 100

x + y = 21 .................. (1)

x - y = 7 .................. (2)

Now,

From, (1) + (2), we get,

2x = 28

or, x = 14

And, the other number is,

14 + y = 21

or, y = 21 - 14

or, y = 7

Thus,

The greater number is = 14

Half of the greater number is= 14/2 = 7

20% of 75 tk is: 75*20/100

                      = 15 tk

Thus,

one can buy 5 oranges with 15 tk.

one can buy 1 orange with 15/5 tk = 3 tk

Now,

Price of 1 orange is 3 tk

Price of 12 oranges (1 dozen) is 3*12 tk = 36 tk

Let sugar be x and water be y,

Then,

y:x = 8:3

or, y/x = 8/3

or, 3y = 8x

or, y = 8x/3 ............................. (1)

Again,

y:(x+2) = 2:1

or, y/(x+2) = 2/1

or, y = 2x + 4

Now,

8x/3 = 2x + 4

or, 8x = 6x + 12

or, 8x - 6x = 12

or, 2x = 12

or, x = 6

Thus, originaly, there were 6 kg of sugar.

(x -1)2 = 400

or, (x -1)2 = (20)2

or, (x -1) = (+-)20

or, x = (+-)20 + 1 = +21 or -19

Now,

x - 5 = +21 - 5 (Taking the positive value)

       = +16

or,

x - 5 = -19 - 5 = -24

In this case, all the numerator will multiply with each other, and all the denominator will multiply with each other, and the resultant will be the answer.

Thus,

(1*3*8*8*1)/ (2*4*4*2*2)= 192 / 128

                                 = 3 / 2

The average of 6 numbers is 9 --> the sum of 6 numbers = (mean)*(number of terms) = 9*6 = 54.

The average of 5 numbers is 7.2 --> the sum of 5 numbers = (mean)*(number of terms) = 7.2*5 = 36.

The discarded number = 54 - 36 = 18.

The Total Number Of Students Is = x+y

And total Number Of Girls=x

Thus part of the class composed of girls= Total Number Of Girls / Total No of Students

i.e x / x+y

For Karim,

5 mintues= 10 pages

30 minutes= 10*30/5 = 60 pages

For Rahim,

10 minutes= 5 pages

30 minutes= 5*30/10 = 15 pages

Total pages= 60+15 pages = 75 pages

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