Jan is as old as Gary was 15 years ago. Six years from now, Gary will be twice as old as Jan will be then. How old is Gary now?

gary is 24

Step-by-step explanation:

let jan be J

let gary  be G

jan was as old as gary was 15 years ago:

J = G-15

in 6 years, gary will 2x as old

G+6 = 2(J+6)

substitute G-15 for J in the second equation:

G+6 = 2(G-15 + 6)

expand.

G=24

what's that

(-5,-28)

i graphed to on desmos.