Question

If 400 is increased in the ratio 2 : 1 and decreased in the ratio 2 : 5, find the ratio of the increased number to decreased number.

• A. $1:5$
• B. $5:1$
• C. $5:3$
• D. $3:7$

Answer 1

The correct option is B $5:1$

Given, 400 is increased in the ratio 2 : 1, then
Increased number $=\frac{2}{1}\times 400=800$

Also, 400 is decreased in the ratio 2 : 5, then
Decreased number $=\frac{2}{5}\times 400=160$

Ratio between the obtained numbers
$=800:160$
$=5:1$