Susan's age will be after 12 years four times as much as twelve years ago. How old is Susan now?

Correct answer:

z1 =  20
z2 =  4

Step-by-step explanation:

z1+12 = 4·(z1-12)

3z1 = 60

z1 = 60/3 = 20

z1 = 20

Our simple equation calculator calculates it.

z2+12 = 4·z2

3z2 = 12

z2 = 12/3 = 4

z2 = 4

Our simple equation calculator calculates it.

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