A grocer had 300kg of oranges he sold 15percent of the oranges in the morning and sold 75percent of the remaining in the afternoon what was the mass of the oranges left
The grocer sold 15% of the 300kg oranges in the morning, which is 15/100 * 300kg = <<15/100*300=45>>45kg
There were 300kg - 45kg = <<300-45=255>>255kg of oranges left.
He then sold 75% of the 255kg remaining in the afternoon, which is 75/100 * 255kg= <<75/100*255=191.25>>191.25kg
The mass of the oranges left is 255kg - 191.25kg = <<255-191.25=63.75>>63.75kg Answer: \boxed{63.75}.