Two numbers are in the ratio 2 : 3. If 4 is subtracted from the first number, the ratio becomes 1 : 2. What are the numbers?
A
14, 21
B
16, 24
C
18, 27
D
20, 30
উত্তরের বিবরণ
Solution:
Let the two numbers be: 2x and 3x
According to the question,
(2x - 4)/3x = 1/2
⇒ 2(2x - 4) = 3x
⇒ 4x - 8 = 3x
⇒ x = 8
∴ First number = 2 × 8 = 16
∴ Second number = 3 × 8 = 24
0
Updated: 4 weeks ago
In a business, the ratio of the capitals of A and B is 2 : 1, that of B and C is 4 : 3 and that of D and C is 6 : 5. What is the ratio of the capitals of A and D?
Created: 4 weeks ago
A
5 : 9
B
12 : 17
C
11 : 15
D
20 : 9
Solution:
Given,
A : B = 2 : 1 ⇒ A/B = 2/1
B : C = 4 : 3 ⇒ B/C = 4/3
D : C = 6 : 5 ⇒ C/D = 5/6
Now, A/D = (A/B) × (B/C) × (C/D)
= (2/1) × (4/3) × (5/6)
= 20/9
∴ A/D = 20 : 9
0
Updated: 4 weeks ago
যদি P = 16 এবং TAP = 37 হয় তবে CUP-কত?
Created: 1 month ago
A
40
B
38
C
36
D
39
প্রশ্ন: যদি P = 16 এবং TAP = 37 হয় তবে CUP-কত?
সমাধান:
দেওয়া আছে,
P = 16
এবং TAP = 37
ইংরেজি বর্ণমালা হতে পাই,
T + A + P = 20 + 1 + 16 = 37
সেই অনুসারে,
CUP = C + U + P = 3 + 21 + 16 = 40
অর্থাৎ, CUP এর মান 40.
0
Updated: 1 month ago
A certain principal amount, invested at simple interest, grows to Tk. 815 after 3 years and Tk. 854 after 4 years. What is the original principal amount?
Created: 4 weeks ago
A
Tk. 658
B
Tk. 612
C
Tk. 698
D
Tk. 710
Solution:
Given,
Amount after 3 years = Tk. 815
Amount after 4 years = Tk. 854
∴ Interest for 1 year = 854 - 815 = Tk. 39
∴ Interest for 3 years = 39 × 3 = Tk. 117
∴ Principal = 815 - 117 = Tk. 698
0
Updated: 4 weeks ago
