Question

if x and y is vary directly and x=5 when y=3 x find when y=15​

Answer 1

Answer:

25 is the correct answer

5/3×15 =25

Answer 2

Answer:

It is given that, x and y vary inversely.

∴  xy=k

For x=5 and y=15 we have:

⇒  5×15=k

⇒  k=75

For y=12, 

⇒12x = 75

$⇒ \: x = \frac{75}{12} \\ ⇒x = \frac{25}{4}$