Question

If b is inversely proportional to c, and b is 5 when c is 12, find b when c = 20

Answer 1

Given that

b is inversely proportional to c

Hence,

b  =  k / c

bc  =  k

k  =  bc ----------> (1)

Substitute b = 5 and c = 12 in Eq (1)

k  =  5 X 12

k  =  60

Substitute c = 20 and k = 60 in Eq (1)

b X 20  =  60

b  =  60/20

b  =  3

Answer :

The value of b is 3.