Answers

2015-02-21T10:51:19+05:30
2K
5K
7K

(2K)² +(5K)² + (7K)²
4K²+25K²+49K²=720
78K²=720
K²=720/78=9.230769231
K=3.038218101
NUMBERS=6.076436202,15.191090505 ,21.267526707
SUM=42.535053414
AVERAGE=14.178351138(SUM/TOTAL NUMBER)
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2015-02-21T11:13:08+05:30
Let the no.'s be 2x,5x and 7x
4x²+25x²+49x²=720
78x²=720
x²=9.23076923077
x=3.03821810125
hence the numbers are
  6.0764362025,15.1910905062,21.2675267088
so,the avg=22.2802660758
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