২৩২৪১
At what rate of compound interest rate per annual will a sum of Tk. 1200 become Tk. 1348.32 in 2 years?
উত্তর
6%
সমাধান
Hints: ধরি, rate হচ্ছে R% per annual
তাহলে, 1200 × {1 + (R/100)}2 = 1348.32
{1 + (R/100)}2 = 134832/120000 = 11236/10000 = (106/100)2
1 + (R/100) = 106/100
R = 6%
২৩২৪২
If t is any integer, which of the following represents an odd number?
উত্তর
2t + 13
সমাধান
We know that, odd×Even = Even and, even + odd = odd so 2t + 13 represents an odd number.
২৩২৪৩
Which of the following is the least like the others?
উত্তর
pyramid
সমাধান
deleterious মানে অনিষ্টকর
harmless মানে নিরীহ
তাই এরা opposite
২৩২৪৪
The area of a rectangle is 460 square meters. If the length is 15% more than the breadth, what is the breadth of the rectangular field?
উত্তর
None of these
সমাধান
Hints: ধরি, breadth = x meter
Length = x + x এর 15% = (115x/100) meter
প্রশ্নমতে, x × (115x/100) = 460
x2 = 400
x = 20 meters
২৩২৪৫
when the price of an article is reduced by 15% the sales increases by 35%. The percentage change in the total amount of receipts is-
উত্তর
14 lof 3/4 increse
সমাধান
If one increased and another reduced/decreased then the formula is
P - Q - P×Q100 = 35 - 15 - 35×15100 = 20 - 5·25 = 14·75% বা 14 of 34% increase
২৩২৪৬
In a 500m race, the ratio of the speeds of two contestants A and B is 3: 4. A has s start of 140 m. Then, A wins by:
উত্তর
10m
সমাধান
Hints: Win post এ যেতে A কে যেতে হবে (500 - 140) বা 360meter
যখন A যায় 3 meter, তখন B যায় 4 meter
A যায় 360 meter তখন B যায় (4/3) × 360 = 480 meter
তাই তখন A win post এ পৌছে যায়, B যায় 480 meter এবং 20 meter বাকি থাকে।
২৩২৪৭
If A's income is 25% less than that of B, then how much percent is B's income more than that of A?
উত্তর
33%
সমাধান
increase/decrease100±Increae/decrease = 25100 - 25 = 2575 = 13 = 33·33 or 3313% Increase = + and decrease = - will be used.
২৩২৪৮
Divide 60 by half and deduct twenty. What do you get
উত্তর
100
সমাধান
Desiccate অর্থ শুষ্ক করা।
২৩২৪৯
The angle between the minute hand and the hour hand of a clock when the times 4.20?
উত্তর
100
সমাধান
(11M-60H)/2=(11×20-60×4)/2=(220-240)/2=-10Ans:100
২৩২৫০
If simple interest on a certain sum of money is Tk. 256 and the rate of interest per annum equals the number of years,then the rate of interest is--
উত্তর
16%
সমাধান
"Let, interest rate = x%
So, number of year x
100 Tk. 1 years = x Tk. Interest
∴ 100 Tk. X years interedt = x × x = x2Tk.
According to the question,x2 = 256∴x = 16