Question

The average age of a man and his son is 40 years. The ratio of their ages is 7:3 respectively. What is the man’s age after 3 years?
2 points
28
12
31
43

Answer 1

Answer:

Let age of men be 7x

According to statement

7x + 3x = 40

10x = 40

x = 40/10 = 4

Age of men = 7x = 7×4 = 28

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Answer 2

Answer:

the average of man is 40 years

let the ages be X

7x+40 =3(3x+40)

7x+ 40=9x+120

40-120=9x-7x

80=2x

40= x