Answer:
Step-by-step explanation:
To solve, start with this equation
So, 8 times 3 gives you how long they spent on art and 8 times 4 gives you how long they spent on science. So they spent...
and...
KC= 31-10= 21
21÷2=10.5
KN= 10.5×4=42
42+1=43
KN=43