২২৩০১
Approximately what percent of class VIII students play Cricket out of the total students playing Cricket.
উত্তর
15
২২৩০২
From a batch of 3000light bulbs, 100 were selected at random and tested. If 5of bulbs on the sample found defective,How many defective bulb will be found in entire batch?
উত্তর
150
সমাধান
Of 100 bulbs, the number of defective bulbs is 5
So, of 3000 bulbs, the number of defective bulbs is = 5 x 3000 / 100 = 150.
২২৩০৩
Approximately what percent of Class X students play Table Tennis out of the total class x students playing the different given games?
উত্তর
18
২২৩০৪
which game has ascending number of students from class IX to XII?
উত্তর
None of these
সমাধান
No game has ascending number of student from class IX to XII.Thats why the answer will be none of these
২২৩০৫
If income of Rahim is 25% more than that of Karim, then income of Karim will be how much less than that of Rahim?
উত্তর
20%
সমাধান
let, Karim's income is 100 tk
as,Rahim's income is 25% more
so, Rahim's income is 125 tk
income of Karim will be how much less than that of Rahim by = (125 - 100)/125 * 100% = 20%
ans: 20%
২২৩০৬
The sum of the angles of a square is:
উত্তর
3600
সমাধান
Since we know all the angles of a square measure 90° and there are 4 angles in total,Sum of the angles = 90° × 4 = 360°
২২৩০৭
If the radius of a circle is increased by 6%, then the area of the circle is increased by -
উত্তর
12.36%
সমাধান
Initial area = πr2
New radius = r + 6% of r = 1.06r
So, new area = π(1.06r)2 = 1.1236πr2
So, percentage of increase in area = (1.1236πr2 - πr2) / πr2 x 100% = 12.36%
২২৩০৮
Sampa is 10 years older than Sanda. In 7 years time, Sampa will be twice asold as Sanda. What is the age of Sampa now in yoars.
উত্তর
13
সমাধান
Let the present age of Sanda is x
Present age of Sampa is x + 10
In 7 years Sampa’s age is x + 10 + 7 = x + 17
B’s age is x + 7
x + 17 = 2(x + 7)
or,x + 17 = 2x + 14
∴ x = 3
so, Present age of Sampa is 3 + 10 = 13 yrs
ans: 13 yrs
২২৩০৯
If x is an integer , then which of the following is always an even integer?
উত্তর
2x+2
সমাধান
x-1, x+1, x+2 এগুলো x এর যে কোন মানের জন্যে even or odd উভয়ই হতে পারে। কিন্তু 2x+2 সবসময় x যে কোন মানের জন্যে even হবে।
২২৩১০
Price of a product is discounted by 20% and the reduced price is then discounted by 5%. The ultimate discount is:
উত্তর
24%
সমাধান
Let, the price of product be 100
and then after first discount price becomes = 100 - 20 = 80 tk
and then again it is discounted by = 5% of 80 = 4 tk
so price of telvision becomes = 80 - 4 = 76 tk
So,The ultimate discount is = 100 - 76 = 24 tk
ans: 24%