The average of three numbers is 28, the first number is

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The average of three numbers is 28, the first number is half of the second, the third number is twice the second, then the third number is

Let the second number be p.

Then first number =	p
	2

and third number = 2p

According to the question,	p	+ p + 2p = 28 × 3
	2

⇒	p + 2p + 4p	= 28 × 3
	2

⇒ 7p = 28 × 3 × 2

⇒	168	= 24
	7

∴ Third number = 2 × 24 = 48
Second method to solve this question with the help of given formulas :

Here, a =	1	, b =	1	, X = 28
	2		2

Third number =	3	× X
	1 + b + ab

Third number =	3 × 4 × 28	= 48
	7