This question doesn't make sence to me could you explain
Is it supposed to be equal to something, maybe "0"? You wouldn't be able to solve this without that.
35 students would not know any of the three languages, because if 30 know French, 19 knew German, and 16 knew Russian, that must mean that 65 students know at least one of the three languages. So you subtract 65 from 100 and end up with 35
An integer is a whole number so 28 is the answer
