১.
The ratio between the two numbers is 3 : 4. If each number is increased by 12, the ratio becomes 5 : 6. The difference between the numbers will be:
সঠিক উত্তর: খ
খ) 6
উত্তর
সঠিক উত্তর: খ
খ) 6
ব্যাখ্যা
The ratio between the two numbers = 3 : 4
Each number is increased by 12
According to the question:
(3x + 12)/(4x + 12) = 5/6
⇒ 6 × (3x + 12) = 5 × (4x + 12)
⇒ 18x + 72 = 20x + 60
⇒ 20x - 18x = 72 - 60
⇒ 2x = 12
⇒ x = 6
Required numbers = 3x = 3 × 6 = 18
4x = 4 × 6 = 24
The difference between the numbers = 24 - 18 = 6
∴ The difference between the numbers will be 6.
Each number is increased by 12
Let the numbers be 3x and 4x
According to the question:
(3x + 12)/(4x + 12) = 5/6
⇒ 6 × (3x + 12) = 5 × (4x + 12)
⇒ 18x + 72 = 20x + 60
⇒ 20x - 18x = 72 - 60
⇒ 2x = 12
⇒ x = 6
Required numbers = 3x = 3 × 6 = 18
4x = 4 × 6 = 24
The difference between the numbers = 24 - 18 = 6
∴ The difference between the numbers will be 6.