It is 2 : 5 : 7 or 1/7 : 5/14 : 1/2
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ratios for example: 2:4 is in proportion with 1:2
i have unsolved qstn ppr..i cn gv if u want
i think they are the format DVD ROM
18th of August in region 1 format (US) and 28th of September in region 2 format (Europe)
Yes it is very normal not to get Maths though it has a lot to do with a personal attitude.