Question

Keith's age is 3 times his son daniel's age. five years back, the sum of their ages was 70 years. find the age of daniel five years hence

Answer 1

Define x:

Let Daniel's age be x

Keith age = 3x

5 years ago:

Daniel = x - 5

Keith = 3x - 5

Form equation and solve for x:

Their sum was 70 years

(x - 5) + (3x - 5) = 70

x - 5 + 3x - 5 = 70

4x - 10 = 70

4x = 80

x = 20

Find Daniel's age in 5 years time:

Daniel = x + 5 = 20 + 5 = 25

Answer: Daniel will be 25 years old

Answer 2

let Daniel age is x

Keith age is 3x

5 years ago -

Daniel age was x - 5

Keith age was 3x - 5

Given : Their sum was 70 years old

(x-5) + (3x-5) = 70

x - 5 + 3x - 5 = 70

4x - 10 = 70

4x = 70 + 10

x = 80 / 4

x = 20

Daniel age is 20 years old.

After 5 years Daniel age will be -

= x + 5 = 20 + 5 = 25.

= 25 years.

Hence , After 5 years Daniel age will be 25 years old.