Answer:
 See attached
Step-by-step explanation:
You want the 2-way table represented by ...
- 120 students total, currently in History or Geography, and having Maths or Science next
- 12 more students in History than Geography
- Maths : Science = 2 : 3
- Science : Maths = 2 : 1 among Geography students.
Sums and Ratios
The number of History students will be 12/2 = 6 more than half the total, so is ...
 History = 120/2 +12/2 = 66
 Geography = 66 -12 = 54
The fraction of the total that is Maths students is 2/(2+3) = 2/5. So the number of Maths students is ...
 Maths = 2/5·120 = 48
 Science = 3/5·120 = 72
The Geography students with Science next is 2/(2+1) = 2/3 of the number of Geography students. That number is ...
 Geography → Science = 2/3·54 = 36
 Geography → Maths = 54 -36 = 18
Table
The attachment shows these numbers in a 2-way table. You may need to interchange rows and columns to match your table.
