Mean Proportion of x10, x15, and x20 is x17. What is the value of m?
1) 19
2) 21
3) 22
4) 23
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Answer
28−x
23−x
=
19−x
28−x
i.e., (23−x)(19−x)=(28−x)
2
x
2
−42x+437=784−56x+x
2
56x−42x=784−437
14x=347
x=
14
347
.
28−x
23−x
=
19−x
28−x
i.e., (23−x)(19−x)=(28−x)
2
x
2
−42x+437=784−56x+x
2
56x−42x=784−437
14x=347
x=
14
347
.
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