Talia uses 10 strawberries and 4 oranges to make 8 servings of fruit salad. how many oranges and strawberries taila needs to make 12 servings?

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.