Question

If p varies directly as q, p=21 when q=7 then find q when p=45

i need step by step ans ​

Answer 1

Step-by-step explanation:

As p varies inversely as q then let,

p=

q

k

, where k is a constant

As p=7 and q=3 satisfies so,

7=

3

k

k=21

∴p=

q

21

For q=

3

7

p=

3

7

21

=3×3=9