Question

X varies inversely as y and x=45 when y is 72. What is x when y is 18?​

Answer 1

Answer:

If X varies inversely as y and x=45 when y is 72 then x is 180 when y is 18.

Step-by-step explanation:

Two quantities x and y are said to vary in inverse proportion if  

$xy = k$-----------( 1 )

where k is a constant.

according to our problem

$x = 45$,

$y = 72$ .

put these values in ( 1 ),

$k = 45 \times 72 = 3,240$

Now if $k = 3240$ and $y = 18 then x =?$

$x (18) = 3240$

$x = \frac{3240}{18}$

$x= 180$