Question

After 12 years I shall be 3 times as old as I was four years ago. Find my present age.

Answer 1

Answer:

3(x-4)=x+12

3x-12=x+12

2x=24

x=12

Answer 2

Answer:

Letting x = present age

 

x + 12  will be my age 12 years from now.

3(x-4)  will be three times as old as I was 4 years ago

 

x+12 = 3(x-4)

Solve for x

 

x+12 = 3x - 12

subtract x from both sides

12 = 2x - 12

add 12 to both sides

24 = 2x

divide both sides by 2

12 = x

 

My present age is 12 years

 

Check:  x+12 = 3(x-4)

          12+12 = 3(12-4)

             24 = 3(8)

             24 = 24

Step-by-step explanation:

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