Question

If x is inversely proportional to y and x=40 when y=5 find.
the value of x when y=25

Answer 1

Answer:

8

Step-by-step explanation:

Two values x and y are said to be in inverse proportion if xy = k

Therefore, when y=25, x =

40×5 = x×25

⇒200 = 25x

⇒x = 200/25

⇒x = 8

Answer 2

Answer: x = 8

Step-by-step explanation:

x = k/y

xy= k

40 (5)= k

200 = k  

xy = 200 <--- final equation ;)

xy= 200

x (25) = 200

x = 200/25

x= 8