২৩১০১
A bank offers 5% compound interest calculated on half-yearly basis. A customer deposits Tk. 1600 each on 1st January and 1st July of a year. At the end of the year, the amount he would have gained by way of interest is:
উত্তর
Tk. 120
সমাধান
Hints: C1 = 1600(1 + 1.5)5 = 1639.51
C2 = (1639.51 + 1600) (1 + .05)5 = 3319.51
The Amount gained = 3319.51 - 2 × 1600 = 119.51 = TK 120
২৩১০২
What is the total interest on TK. 800 at 12.5% per annum for 9 months?
উত্তর
TK. 75
সমাধান
9 months = 9/12 year = 3/4 year
Interest, I = pnr = 800 x 3/4 x 12.5/100 = 75 taka
২৩১০৩
A coat was sold for TK. 75. The coat was sold for 150% of the cost of the coat. How much did the coat cost?
উত্তর
TK. 50
সমাধান
Given that, 150% = 75
= > 1 % = 75/150
= > 100% = 75/150 * 100 = 50
therefore, the coat cost = 50 tk.
২৩১০৪
If you had only one match stick and entered a COLD and DARK room, where there was an oil heater, an oil lamp and a candle , which would you light first?
উত্তর
None of these
২৩১০৫
If the stock value of XYZ Company drops from TK. 25 per share to TK. 21 per share, what is the percentage decrease?
উত্তর
16%
সমাধান
প্রিয়ংবদা = প্রিয় কথা বলে যে। উপপদ তৎপুরুষ।
২৩১০৬
The positive difference between the squares of any two consecutive integers is always -
উত্তর
an odd number
সমাধান
Let, two consecutive integers are 2 and 322=4 and 32=9 the difference is 9-4=5 which is an odd number.
২৩১০৭
If x+y = z and x = y, then all of the following are true EXCEPT -
উত্তর
x-y=2z
সমাধান
If x=y then y+y=z So, 2y=z But in option D, x-y=2zSo, y-y = 2z or, z =0 which is not possible so option D is not true
২৩১০৮
If the difference between two numbers is 7 and their product is 60, then one of the two numbers must be-
উত্তর
5
সমাধান
x - y = 7; x = (y + 7)
xy = 60
or , (y + 7).y = 60
or, y² + 7y - 60 = 0
or, (y + 12) (y – 5) = 0
So, Y = - 12,5
So, the two number is 12 and 5
২৩১০৯
If (3x+2y) = 8 and (2x-y) = 3, what is the value of "x"?
উত্তর
3
সমাধান
3x + 2y = 8...... (1)
2x - y = 3........ (2)
(1) + (2)×2 করে পাই,
7x = 14
= > x = 14/7
∴x = 2
২৩১১০
In Sajib's collection, Bangladeshi stamp is 3 times more than the stamps of other countries. Which of the following cannot be the number of stamps in Sajib's collection?
উত্তর
54