The ratio of two numbers is 5: 6. If their product is 1920, then what is the sum of both the numbers?

Correct option is D

Given:
Ratio = 5:6; Product = 1920.
Solution:

Let numbers be 5k and 6k; Product = (5k) × (6k).
Product = 30$$k^2$$​ = 1920
$$k^2$$​ = $$\frac{1920}{30}$$​ = 64
k = 8
Numbers = 5 × 8 = 40, 6 × 8 = 48
Sum = 40 + 48 = 88
Answer: (d) 88