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?
A
20 : 9
B
45 : 28
C
12 : 7
D
6 : 5
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Question: 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?
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: 1 month ago
Find the simple interest on BDT 12000 at 8% per annum for 6 months.
Created: 1 month ago
A
Tk. 480
B
Tk. 560
C
Tk. 400
D
Tk. 420
Question: Find the simple interest on BDT 12000 at 8% per annum for 6 months.
Solution:
Principal, P = 12000 Taka
Time, n = 6 months = 6/12 = 1/2 years
Rate of interest, r = 8% = 8/100
Simple Interest, I = P × n × r
= 12000 × (1/2) × (8/100)
= (12000 × 1 × 8)/(2 × 100)
= 96000/200
= 480
∴ The simple interest is Tk. 480.
0
Updated: 1 month ago
60% of a number is 30 less than three-fourth of the same number. Find the number.
Created: 1 month ago
A
180
B
200
C
320
D
175
Question: 60% of a number is 30 less than three-fourth of the same number. Find the number.
Solution:
Let,
the number = x.
ATQ,
60% of x = (3/4) of x - 30
⇒ 60x/100 = (3x/4) - 30
⇒ 3x/5 = (3x/4) - 30
⇒ (3x/4) - (3x/5) = 30
⇒ (15x - 12x)/20 = 30
⇒ 3x/20 = 30
∴ x = 200
So, the number is 200.
0
Updated: 1 month ago
A 42-liter mixture contains milk and water in a 3 : 4 ratio. How much milk should be added to the mixture to make the ratio equal?
Created: 1 month ago
A
7 liters
B
4 liters
C
6 liters
D
8 liters
Question: A 42-liter mixture contains milk and water in a 3 : 4 ratio. How much milk should be added to the mixture to make the ratio equal?
Solution:
The ratio of milk to water is 3 : 4
Total portion = 3 + 4 = 7
Quantity of milk = 42 × (3/7) = 18 liters.
Quantity of water = 42 × (4/7) = 24 liters.
Let,
Quantity of milk to be added = x liters
According to the question,
(18 + x) : 24 = 1 : 1
⇒ (18 + x)/24 = 1/1
⇒ 18 + x = 24
⇒ x = 24 - 18
⇒ x = 6
∴ Quantity of milk to be added = 6 liters
0
Updated: 1 month ago
