Today I was working with a student preparing him for the upcoming SAT in June. We came across an interesting question, which I will share with everyone here. Here is the question:
(Q) There is a number ‘WXYZ’, (where W,X,Y and Z are integers), such that
x = w + y + z [equation(1)]
w = y + 1 [equation(2)]
z = w – 5 [equation(3)]
Find this number ‘WXYZ’?
In order to solve a system of equations involving four unknowns, we need four equations (relationships). We are only given three relationships, "Houston we have a problem." Do not worry, we have another approach. Let us find x in terms of...