The ratio of two numbers is 4 : 5 when the first is increased

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The ratio of two numbers is 4 : 5 when the first is increased by 20% and the second is decreased by 20%, the ratio of the resulting numbers is

1. 4 : 5
2. 5 : 4
3. 5 : 6
4. 6 : 5

Correct Option: D

Let the numbers be 4k and m5k .
After corresponding increase or decrease,

Required ratio = 4k ×	120	: 5k ×	80
	100		100

Hence , Required ratio = 12k : 10k = 6 : 5