Talia would need 15 strawberries and 6 oranges. This is solved by cross multiplication. (S)trawberries explanation: 

 S will be what is multiplied by 8 which will get us the same product of 10 * 12, which is 120. S will be our answer for the strawberries.
S' solution: S = 

 → S =

 S = 15
Therefore S is 15. (O)ranges explanation: 

 Same thing applies, but this time we need the number O equals when multiplied by 8, will get us the product of 12 * 4, which is 48. 
O's solution: O = 

 O = 

 O = 6
Therefore O is 6.