Three positive numbers are in the ratio 2 : 3 : 4. The sum of their squares is 2349 . The average of the first two numbers is:
Answer & explanation
Correct answer: option 4
Lets assume numbers are 2x, 3x, and 4x
As per question
27x² = 2349
x² = 87
x ≅ 9
Avg. of first two numbers =\(\frac{ (2 × 9 + 3 × 9)}{2}\) = 22.5