Multiple choice general knowledge If a+b=10; then (a+b/2)+(b+a/2)= 5 10 15 20 25 Reveal answer Fill a bubble to check yourself C Correct answer Explanation Substitute a+b=10 into the expression: (a+b/2)+(b+a/2) = a + b/2 + b + a/2 = (3/2)a + (3/2)b = (3/2)(a+b) = (3/2)(10) = 15. The key is to group like terms and factor out the common sum.