An artist builds a sculpture made of glass and then fills it with sand. The sand drains through three tiny, different-sized holes in the bottom of the sculpture. With sand coming out of all three holes, the sculpture will be empty in exactly 5 days. If Hole B and C were blocked, the sand would completely drain through Hole A in 16 days. Hole B drains 10 times as fast as Hole C. If the sculpture were filled with sand and Holes A and B were blocked, how long would it take the sand to drain through Hole C?

Pick the equation below that best represents this situation, where x represents days.