$180:y$*40=2400

180:y=2400/40

180:y=60

y=180:60

y=3

26000-a=502*28

26000-a=14056

-a+11944 = 0

a-11944 = 0

a = 11944

$180:y$*40=2400 180:y=2400/40 180:y=60 y=180:60 y=3 26000-a=502*28 26000-a=14056 -a+11944 = 0 a-11944 = 0 a = 11944