Answer :
w = women
m = men
w = 3m (from the first sentence)
1/3w - 3/5m = 120
subsitute 3m for w
1/3(3m) - 3/5m = 120
m - 3/5m = 120
2/5m = 120
2m = 600
m = 300
back to the original equation
w = 3m
w = 3(300)
w = 900
900 women + 300 men = 1200 people.
m = men
w = 3m (from the first sentence)
1/3w - 3/5m = 120
subsitute 3m for w
1/3(3m) - 3/5m = 120
m - 3/5m = 120
2/5m = 120
2m = 600
m = 300
back to the original equation
w = 3m
w = 3(300)
w = 900
900 women + 300 men = 1200 people.