Question

11. If 9,15 and x are in continued proportion, find the value of x.
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Answer 1

9:15::15:x
Product of extremes= product of means
9*x= 15*15
25 =x

Answer 2

Answer:

9,15,x 9 and 15 jave a difference of 6 therefore x=15+6, i.e x=21

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