Age problems

A) Alex is 3 times as old as he was 2 years ago. How old is he now?

b) Casey was twice as old as his sister 3 years ago. Now he is 5 years older than his sister. How old is Casey?

c) Jessica is 4 years younger than Jennifer now. In 10 years, Jessica will be twice the age that Jennifer is now. Find the present ages of Jennifer and Jessica,

Correct result:

A =  3
C =  16
J =  2
N =  6

Solution:


A=3(A-2)

A=3•(A-2)

2A = 6

A = 3

Our simple equation calculator calculates it.

C = 2(S-3)
C = S+5

C = 2•(S-3)
C = S+5

C-2S = -6
C-S = 5

C = 16
S = 11

Our linear equations calculator calculates it.

J = N - 4
J+10 = 2•N

J-N = -4
J-2N = -10

J = 2
N = 6

Our linear equations calculator calculates it.



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