If x is the mean proportional between 12.8 and 64.8 and y is the third – McqOptions

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1.	If x is the mean proportional between 12.8 and 64.8 and y is the third proportional to 38.4 and 57.6, then 2x : y is equal to:
A.	3 : 4
B.	1 : 2
C.	2 : 3
D.	4 : 5
Answer» D. 4 : 5

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