Question

X is 5 times older than his son, y, the sum of their ages today is equivalent to three dozens

Answer 1

X=5y

X+y=3dozen=36

5y+y=36

6y=36

Y=6

X=30

@skb

Answer 2

.

x is 5 times y

x = 5y

their sum is 3 dozen

x + y = 3 (12)

x + y = 36

.

Form the equation and solve for x and y:

x = 5y -------------- [ 1 ]

x + y = 36 ------- [ 2]

.

Substitute [ 1 ] into [ 2 ]:

5y + y = 36 [ Replace x with 5y ]

6y = 36 [ Combine like terms ]

y = 6 [ Divide both sides by 6 ]

.

Substitute y = 6 into [ 1 ]

x = 5y

x = 5( 6) [ Replace y with 6 ]

x = 30 [ Multiply ]

.

Answer: x = 30, y = 6