X is 6 times as large as Y. By what percentage is Y lesser than X?

Correct option is A

Given:

X = 6Y

Solution:

​$$\frac{X - Y}{X} \times 100 = \frac{6Y - Y}{6Y} \times 100 = \frac{5Y}{6Y} \times 100 = \frac{5}{6} \times 100 = 83\frac 13\%$$

Alternate Method: