A pole is painted with four different colors. One-third is painted by white, 310 is painted by black and 215 part is painted by yellow color and rest is painted black. Find the portion painted with black.
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Answer:
Let the total length of the pole be x
3
x
+
5
x
+7=x
⇒
15
5x+3x+105
=x
⇒8x+105=15x⇒7x=105
⇒x=
7
105
=15
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