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മൂന്ന് സംഖ്യകളുടെ വർഗ്ഗങ്ങളുടെ ആകെത്തുക 138 ആണ്, അതേസമയം രണ്ട് സംഖ്യകളുടെ ഗുണനഫലങ്ങളുടെ ആകെത്തുക 131 ആണ്. സംഖ്യകളുടെ ആകെത്തുക:

A30

B20

C40

D25

Answer:

B. 20

Read Explanation:

സംഖ്യകൾx, y, z ആയാൽ

x2+y2+z2=138x^2+y^2+z^2=138

xy+yz+xz=131xy+yz+xz=131

(x+y+z)2=x2+y2+z2+2(xy+yz+xz)(x+y+z)^2=x^2+y^2+z^2+2(xy+yz+xz)

=138+2×131=138+2\times131

=400=400

x+y+z=400=20x+y+z=\sqrt{400}=20


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