Eric had to paint some boxes. On the first day, the number of boxes he painted was 20% of the number of boxes that he had not painted. One week later, he painted another 115 boxes. As a result, the total number of painted boxes became 24 more than ²₅ of the total number of boxes. How many less boxes were painted than unpainted on the first day?

	Painted	Not painted	Total
Before	1x5 = 5 u	5x5 = 25 u	6x5 = 30 u
Change	+ 115	- 115
After	5 u + 115	25 u - 115	30 u
Comparing painted and not painted boxes in the end	2x6 + 24 = 12 u + 24	3x6 - 24 = 18 u - 24	5x6 = 30 u

20% = ²⁰₁₀₀ = ¹₅
Painted : Not painted = 1 : 5

The total number of boxes remains unchanged. Make the total number of boxes at first and in the end the same.  LCM of 6 and 5 is 30.

The number of boxes painted in the end is repeated.

12 u + 24 = 5 u + 115
12 u - 5 u = 115 - 24
7 u = 91

1 u = 91 ÷ 7 = 13

Number of less boxes that were painted than not painted on the first day
= 25 u - 5 u
= 20 u
= 20 x 13
= 260

Answer(s): 260