1.

The average of three numbers is 17. the average of two of these numbers is 25.what is the third number?

Answer»

LET the NUMBER to be found=X

let the other 2 NUMBERS= x and y

(y+z)/2=25

∴y+z=50


(x+y+z)/3=17

(x+50)/3=17

(x+50)=51

∴x=1


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