In a boutique that sells skirts, 300 white skirts were sold and 25% of the remaining skirts that were sold were blue. Of the leftover, 40% of the skirts sold were purple skirts and the rest were yellow skirts. Given that the number of yellow skirts sold was 20% of the total number of skirts sold, how many blue and white skirts were sold altogether?
25% = ²⁵₁₀₀ = ¹₄
40% = ⁴⁰₁₀₀ = ²₅
20% = ²⁰₁₀₀ = ¹₅

White	Blue	Purple	Yellow
300	1x5	3x5
		2x3	3x3
4x9			1x9
25 u	5 u	6 u	9 u

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

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

Number of white skirts
= 36 u - 5 u - 6 u
= 25 u

25 u = 300

1 u = 300 ÷ 25 = 12

Number of blue and white skirts
= 5 u + 300
= (5 x 12) + 300
= 60 + 300
= 360

Answer(s): 360