Sorry for my bad explanation.
a) Men with spec = 2/7
b) Women with spec = 50
c) Men and women without spec = 94
d) Men with no spec = 1 – 2/7
e) Therefore, (b) + (c) will include,
(women with spec) + (women without spec) + (men without spec) = 94 + 50 = 144
This will give us all the women there and men without spec.
f) Since equal amount of men and women, if there is 7 units of men there will be 7 units of women.
At (e), we got all women which is 7 units, and men without spec is 5 units.
Therefore, 7 units +5 units = 144