A tin of oil was 4/5 full. When 6 bottles of oil was taken

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A tin of oil was 4/5 full. When 6 bottles of oil was taken out and 4 bottles of oil was poured into it, it was 3/4 full. How many bottles of oil can the tin contain ?

Let the tin contain p bottles of oil.
As given,

4	p − 6 + 4 =	3	p
5		4

4	p −	3	p = 2
5		4

⇒		16 − 15		p = 2
		20

⇒	p	= 2
	20

⇒ p = 2 × 20 = 40
∴ The tin can contain 40 bottles.