২২৪০১
If a number of divisible by 102, then it is also divisible by:
উত্তর
11
সমাধান
102 is a even number. Every even number is divisible by 2. So, easily the answer is 2.
২২৪০২
The compund interest at 10% per annum on a certain amount of money for two years is TK. 10.50. Then what is the principal amount in TaKa?
উত্তর
50
সমাধান
C = P(1 + r/n)nt [C = principal with interest, P = principal, r = rate of interest, n = number of times interest is compounded per time period, t = number of time periods]
Here, r = 10% = 10/100 = 0.1, n = 1, t = 2
Interest, I = C - P = P(1 + r/n)nt - P = P{(1 + r/n)nt - 1} = P{(1 + 0.1)1x2 - 1} = 0.21P
So, 0.21P = 10.5
or, P = 10.5/0.21 = 50 TK
২২৪০৩
With 12.50% simple interest rate how many years are needed for a principal to get double?
উত্তর
8
সমাধান
Principal with simple interest, A = P(1 + n r)
or, 2P = P(1 + n x 12.5/100)
or, 2P/P = 1 + n x 12.5/100
or, n x 12.5/100 = 2 - 1
or, n x 12.5/100 = 1
or, n = 1 x 100 / 12.5 = 8 years
২২৪০৪
If 25% of 220 equals 5.5% of w, then w is--
উত্তর
1000
সমাধান
25% of 220 = 220 ×. 25 = 55
So, w = (55×100)/5.5 = 1000
২২৪০৫
If 2x - 1 =9 , then what is the value of 10x -5?
উত্তর
45
সমাধান
2x - 1 = 9
2x = 10
5× 2x = 5× 10
10x = 50
10x - 5 = 50 - 5 = 45
২২৪০৬
A man's age is now 3 times his son's age. Eight years back, the man's age was 5 times his son's age. what is the present age of the son?
উত্তর
16
সমাধান
Let, present age of the son is x
So, 3x = 5 ( x - 8) + 8
3x = 5x - 40 + 8
2x = 32
x = 16
২২৪০৭
The difference between two numbers is 7 and their product is 60. One of the two numbers must be ---
উত্তর
5
সমাধান
Let, the smaller no be x
so, the greater no is x + 7
According to question , x( x + 7) = 60
x2 + 7x - 60 = 0
x = 5, - 12
২২৪০৮
You deposited dolor 124 in a bank with an interest rate of 2% each year. If they offer a simple interest rate, what will be you balance after 9 years?
উত্তর
146
সমাধান
124 ×. 02 × 9 = 22.32
124 + 22.32 = 146.32 = 146
২২৪০৯
what is the next number in the series 1 , 4 , 9 , 16..........
উত্তর
25
সমাধান
The series is
12, 22, 32, 42, 52, .......... n2
২২৪১০
which of the following is bigger than value of 2/3?
উত্তর
16/21
সমাধান
2/3 = . 66
11/18 = . 61
20/36 = . 55
16/21 = . 76
29/54 = . 53