The pictograph shows the number of eggs sold by a trader in three days. If the trader still had 115 eggs left after the three days, calculate the number of eggs he had at first.

From the given pictograph,

Eggs sold on Monday $=3\times 25=75$

Eggs sold on Tuesday $=5\times 25=125$

Eggs sold on Wednesday $=4\times 25=100$

Eggs left after three days = 115

Therefore, total number of eggs he had = 75 + 125 + 100 + 115 = 415