Correct Answer - Option 3 : 240
Given:
LCM = 1920
HCF = 16
First number = 128
Concept used:
If 'a' and 'b' are two numbers, then LCM × HCF = a × b
Calculations:
Let the first number be 'a' and second number be 'b'.
⇒ LCM × HCF = a × b
⇒ 1920 × 16 = 128 × b
⇒ b = (1920 × 16)/128
⇒ b = 240
∴ The other number is 240.