Question 64
The variable x varies directly as y and x = 80 when y is 160. What is y when x is 64?
If x varies directly as y.
∴xy=k (constant)...(i)
If x=80 and y =160
∴xy=80160=12⇒k=12
When x = 64, then from Eq(i),
64y=12 [Putting the value of k]
⇒y=64×2=128