The ratio of history questions to total questions is 4:5
So yes obviously the ratio of total questions to history questions is 5:4
Now if total questions are 5 , and there are 4 history questions then it means there will 1 geography question
So Yes , the ratio of history questions to geography questions is 4:1
But the last one is Not correct , because if there is 1 geography question then there are 4 history questions , it means there are 3 more history questions then geography questions.
So
a. The ration of total questions to history questions is 5:4 ------------TRUE
b. the ratio of history questions to geography questions is 4:1 ------TRUE
c. There is 1 more history question than geography questions-------FALSE