Question

V is directly proportional to B

V is 15 when B is 10.
Write an equation for this and use it to find the value of B when V = 24

Answer 1

B = 16

Explanation:

Given V is directly proportional to B then the equation relating them is

V = kB ← k is the constant of proportion

To find k use the condition

V = 15 when B = 10

15 = 10k ( divide both sides by 10 )

1.5 = k

V = 1.5B ← equation of proportion

when V = 24 , then

24 = 1.5B ( divide both sides by 1.5 )

16 = B

Answer 2

15_10

24_? criscos 15x=240

x= 240÷15

x=16