Given that C and D are two points on the line AB, AC: CB = 5:7, ad: DB = 5:11, if CD = 10cm, find the length of ab
AC:CB=5:7
Then AC = 5 / 12ab
AD:DB=5:11
Then ad = 5 / 16ab
CD=AC-AD
=(5/12-5/16)AB
=5/48AB
AB=CD*48/5=96cm
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