1.

यदि `x^(2)-y^(2)=80` और `x-y=8` है तो `x` और `y` का औसत ज्ञात करें।A. 2B. 3C. 4D. 5

Answer» Correct Answer - D
`x^(2)-y^(2)=80`
`implies (x-y)(x+y)=80`
`x-y=8`………….i
`:. (x+y)xx8=80`
`(x+y)=10`…………..ii
Now average of `x` and `y`
`=(x=y)/2=10/2=5`


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