The sum of ali and mel's age is 39. if mel is 3 years younger than twice ali's age, how old is mel?

Age of Mel is 25 years.

Step-by-step explanation:

It is given that,the sum of Ali and Mel's age is 39. If Mel is 3 years younger than twice Ali's age.

Let 'x' be the Ali's age  and 'y' be the Mel's age

To find the value of x and y

sum of Ali and Mel's age is 39

⇒ x + y = 39    (1)

  Mel is 3 years younger than twice Ali's age

⇒ y = 2x - 3   (2)

⇒  2x - y = 3  (3)

(1) + (3) ⇒  

 x + y = 39

2x - y = 3

3x   = 42

x = 42/3 = 14

y = 2x - 3 = 14*2 - 3  = 25

Therefore the age of Ali = 14

Age of Mel = 25

first, we define the variables:

x: number of years after 1950

f (x): amount of vinyl sold.

then, with the variables defined, we have:

68594 vinyl records were sold in 1958 > f (8) = 68594

91299 vinyl records were sold in 1961 > f (11) = 91299

38720 vinyl records were sold in 1952 > f (2) = 38720

161743 vinyl records were sold in 1967 > f (17) = 161743

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