In a kiosk that sells windbreakers, 980 blue windbreakers were sold and 25% of the remaining windbreakers that were sold were brown. Of the leftover, 40% of the windbreakers sold were purple windbreakers and the rest were pink windbreakers. Given that the number of pink windbreakers sold was 10% of the total number of windbreakers sold, how many brown and blue windbreakers were sold altogether?
25% = ²⁵₁₀₀ = ¹₄
40% = ⁴⁰₁₀₀ = ²₅
10% = ¹⁰₁₀₀ = ¹₁₀

Blue	Brown	Purple	Pink
980	1x5	3x5
		2x3	3x3
9x9			1x9
70 u	5 u	6 u	9 u

The total number of purple and pink shirts is the combined repeated identity. Make the total number of purple and pink shirts the same. LCM of 3 and 5 is 15.

The number of pink shirts is repeated. Make the number of pink shirts the same. LCM of 9 and 1 is 9.

Number of blue windbreakers
= 81 u - 5 u - 6 u
= 70 u

70 u = 980

1 u = 980 ÷ 70 = 14

Number of brown and blue windbreakers
= 5 u + 980
= (5 x 14) + 980
= 70 + 980
= 1050

Answer(s): 1050