A number 20 is divided into two parts. One of them being three times the other. Find the smaller part.
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Answer:
Let One part be x.
So, the other part is (20−x)
According to question.
3x
2
=(20−x)+10
3x
2
=30−x
3x
2
+x−30=0
3x
2
+10x−9x−30=0
x(3x+10)−3(3x+10)=0
(3x+10)(x−3)=0
x=3 , x=
3
−10
Hence, the two parts =3,17
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