Question

q is directly proportional to r q=76 r=20
Find q when r=45

Answer 1

'q' is directly promotional to 'r'.

When q= 76; r= 20

When r= 45; q=?

$q = kr$

k is a constant.

$76 = k20$

$k = \frac{76}{20}$

$k = \frac{38}{10}$

When r= 45;

$q = kr$

$q = \frac{38}{10} \times 45$

$q = 171$