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A man buys spirit at Rs 60 per litre, adds water to it and then sells at Rs 75 per litre. What is the ratio of spirit to water if his profit in the deal is 37.5%?

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let a=b

Then,

1. ab = a^2

2. ab - b^2 = a^2 - b^2

3. b(a - b) = (a + b)(a - b)

4. b = a + b

5. b = b + b

6. b = 2b

7. 1 = 2

which step is the flaw in the above proof?
When I was going to temple I Saw a person with 5 kids,each kid having 5 bags with 5 parrots in each bag.How many were going to temple?
A.one man,5 kids
B.a kid,a man.total 2 persons were going
C.1,only me
D.2 men,5 kids