If x is inversely proportional to y and y is directly proportional to z, then xy is :
Answer & explanation
Correct answer: option 3
x is proportional to y.
Therefore, x/y=a (a is a constant)
y is proportional to z, so:
y/z=b (b is a constant)
Multiplying both the equations, we get:
x/y×y/z=a×b
x/z=ab (ab is a constant)