10:28::5:?
1)12
2)7
3)9
4)17
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•proportion formulea
= product of mean= product of extreme
• 10×X=28×5
• 10X = 140
•X= 140÷10
• 14
= product of mean= product of extreme
• 10×X=28×5
• 10X = 140
•X= 140÷10
• 14
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