- A20
- B30
- C15
- D25
Show answer
Concept: If , then is the fourth proportional: .
- Here .
- .
- Check: ✓
Trick: Fourth proportional = (2nd × 3rd) ÷ 1st, i.e. .
Answer: (A) 20
अवधारणा: यदि हो, तो चतुर्थानुपाती है: ।
- यहाँ ।
- ।
- जाँच: ✓
ट्रिक: चतुर्थानुपाती = (दूसरा × तीसरा) ÷ पहला, यानी ।
उत्तर: (A) 20
