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SAT - Math - Ratio and Proportion

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

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

y = kx

24 = k6

k = 4

 

when x = 5

y = kx = 4*5 = 20