60. A store purchased a batch of oranges. On the first day, it sold $40 \%$, on the second day, it sold $50 \%$ of the remaining oranges, and on the third day, it sold $\frac{1}{3}$ less than the first day. At this point, 10 kilograms were left, so the total weight of this batch of oranges was $\qquad$ kilograms.
Reference answer: 300