On the night of the dance 70/100*400 = <<70/100*400=280>>280 students who showed up to the party were invited.
If 40% of those invited to the party had their invitation revoked, there were 40/100*280 = <<40/100*280=112>>112 students who showed up and had their invitation revoked.
The number of invited students who attended the party is 280-112 = <<280-112=168>>168
#### 168