20% discount means (100 - 20) or, 80% of original price.

Thus,

80% of the original price is 100 tk

100% of the original price is 100/.8 tk

                                       = 125 tk

5x-3 = 2x + 9

or, 5x - 2x = 9 + 3

or, 3x = 12

or, x = 12/3 = 4

A/Q,

x*x*1.5 = 216

or, x2 = 216 / 1.5

or, x2 = 144

or, x = 12

breadth = 12

so, length is = 1.5 * 12 = 18

Thus, perimeter = 2 * (12 + 18)

                       = 2 * 30

                       = 60

A/Q,

1.25x = 250

or, x = 250/1.25

or, x = 200

20% loss means, selling at (100-20)% of the price

or, 80% of the price.

80% of 400 tk is = 400*80/100

                        = 320 tk

the train,

while traveling for 6 minutes, travels 4 miles

if it travels for 1 hour or 60 minutes, travels 4*60/6 miles

                                                             = 40 miles

x + y + y + z + z + x = 9 + 7 + 9

or, 2x + 2y + 2z = 25

or, (x + y + z) = 25/2

or, average of x, y, z is:

(x + y + z)/3 = 25/6

If a bag of chcken food is divided among 18 chickens, then it lasts 54 days.

If It is given to 1` chicken, it will last (54*18) days

                                                 = 972 days

Now,

If again, the bag of chicekn food is divided among 12 chickens, the days will be divided by 12.

Thus,

Days = 972/12

         = 81

5% increase in cost of Carriage means cost of carriage

= 1500*105/100 tk

= 1575 tk

8% increase in cost of Horse means cost of Horse

= 2000*108/100 tk

= 2160 tk

Total cost of Carriage and Horse = (1575 + 2160) tk

                                               = 3735 tk

The simplest rule of multiplication with decimal point:

1. Multiply the numbers without minding the decimal points.

2. After deriving the value,find out how many digits are there at the right side after the decimal points for every number you multiplied.

3. Place decimal point onto your derived value, equal to the sum of number of digits found in every number multiplied, counting from  from left to right.

25 km can be driven with 2 litres of Octane

150 km can be driven with 2*150/25 litres of Octane

                                    = 300/25 litres of Octane

                                    = 12 Litres of Octane

If, Original CP is 100 taka

Producer sells it to wholesaler at 120 taka

ar 10% profit,

Wholesaler sells it to Retailer at 110 taka, when wholesaler buys it at 100 taka.

So,

when CP is 100 taka, SP to Retailer is 110 taka

when CP is 120 taka, SP to Retailer is 110 * 120 / 100 taka

                                                           = 132 taka

Thus,

Retailer buys it for 132 taka, when the original CP is 100 taka

Retailer buys it for 244 taka, when the original CP is (100 * 244 / 132) taka

= 184.85 taka

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