Younger 7012

Lena is seven years older than Monica. If both Lena and Monica were four years younger, she would be twice as old as Monica. How old is Lena?

Correct answer:

L =  18
M =  11

Step-by-step explanation:


L=7+M
L-4 = 2(M-4)

L=7+M
L-4 = 2·(M-4)

L-M = 7
L-2M = -4

Row 2 - Row 1 → Row 2
L-M = 7
-M = -11


M = -11/-1 = 11
L = 7+M = 7+11 = 18

L = 18
M = 11

Our linear equations calculator calculates it.



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