Root is to Tree as Foundation is to ?

A. BUILDING

Key is to Lock as Password is to ?

B. ACCESS

If X * Y = Z, Y / X = W, and W + 5 = V, what is the value of V if X = 2 and Y = 10?

C. 15

If M + N = O, N * 2 = P, and P - O = Q, what is the value of Q if M = 4 and N = 6?

A. -2

If A / B = C, B + C = D, and D - 3 = E, what is the value of E if A = 24 and B = 6?

C. 9