Together, Andrea and Brian weigh p pounds; Brian weighs 10 pounds more than Andrea. Brian and Andrea's dog, Cubby, weighs p/4 pounds more than Andrea. In terms of p, what is Cubby's weight in pounds?
(A) p/2 - 10
(B) 3p/4 - 5
(C) 3p/2 - 5
(D) 5p/4 - 10
(E) 5p - 5
A + B = p
B = A + 10
Subtract the eqations
2A = p-10
A = p/2 - 5
Now plug in
C = (p/4 + A)
C = p/4 + p/2 -5
C = 3p/4 - 5
B
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