Question
In a box, 70% of the pencils are silver pencils and the rest are black and grey pencils. The number of grey pencils is five times the number of black pencils. What percentage of the pencils in the box are black pencils?
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In a box, 70% of the pencils are silver pencils and the rest are black and grey pencils. The number of grey pencils is five times the number of black pencils. What percentage of the pencils in the box are black pencils?