If y= kx, where k is a constant , and y= 24 when x=6, what is the value of y when x =5 ?

A 6
B 15
C 20
D 23

Correct Answer: 20

y = kx and y = 24, x = 6 ∴ 24 = k6 ⇒k = 246 = 4Now, if x  = 5 ,then , y  = 4.5  = 20 
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