Answers

2015-08-09T12:21:53+08:00

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The son is 10 yrs old and the father is 40 yrs old..

solution

let m = age of the son

4m = 20 +2m
4m- 2m =20
2m = 20 gcf 2.. divide both by 2
m= 20

therefore the son is 10 yrs old


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2015-08-09T12:48:28+08:00

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
A father is 4 time as old as his son. In 20 years, the father will be twice as old as his son. Find the present age of each.

R: Let x = Son's age
    4x = Father's age
  
                         Present                     In 20 years
Son                        x                           x + 20
Father                    4x                          4x + 20

E: 4x + 20 = 2(x + 20)

S: 4x + 20 = 2(x + 20)
    4x + 20 = 2x + 40
    4x - 2x = 40 - 20
     \frac{2x}{2} =  \frac{20}{2}
    x = 10; 4x = 40

A: The son is 10 years old while his father is 40 years old.

C: 4x + 20 = 2(x + 20)
    4(10) + 20 = 2(x + 20)
    40 + 20 = 2(10 + 20)
    60 = 60 (Equal meaning correct)

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