Answer:
1. 32.5
2. 16.3
Explanation:
This is algebra. We need to find the unknown values.
 1. 23 = x – 9.5
 Adding 9.5 on both sides of the equation
 23 + 9.5 = x – 9.5 + 9.5
 32.5 = x
∴ x = 32.5
 2. 12 = k – 4.3
Adding 4.3 on both sides of the equation
12 + 4.3 = k – 4.3 + 4.3
16.3 = k
∴ k = 16.3