Question

Four years ago, Mr. dela Cruz was 5 times as old as his son. How old is his son now if his age is 1/3
of his father's present age?​

Answer 1

Answer:

Step-by-step explanation:

Let 'x' be age of son.

Let 'y' be age of Mr. Dela Cruz

5(x-4)=y-4

5x-20=y-4

5x-y=-4+20

5x-y=16----------(1)

x=\frac{1}{3} y

3x=y

3x-y=0------------(2)

-y=-3x

y=3x

Substituting y=3x in equation (1)

5x-3x=16

2x=16

x=/frac{16}{2}

x=8

Age of son is 8 years

Answer 2

Answer:

8

Step-by-step explanation:

(D - 4) = 5 ( S - 4

D = 3S.

3S - 4 = 5S - 20

S = 8