PSLE
At first, Mary had an equal number of black and yellow stickers . She gave away ³₅ of her black stickers and some yellow stickers. In the end, she was left with ¹₄ of her stickers. What fraction of the yellow stickers did Mary give away?

	Black	Yellow	Total
Comparing black stickers and yellow stickers at first	1x5x2 = 10 u	1x5x2 =  10 u	2x5x2 =  20 u
Before	5x2 = 10 u	10 u	4x5 = 20 u
Change	- 3x2 = - 6 u	- 9 u	- 1x5 = - 15 u
After	2x2 = 4 u	1 u	3x5 = 5 u

After2_x2 =
4 u
1 u3_x5 =
5 u
The number of black stickers at first is repeated. Make the number of black stickers the first the same. LCM of 5 and 1 is 5.

The total number of stickers at first is repeated. Make the total number of stickers at first the same. LCM of 10 and 4 is 20.

Number of yellow stickers that Mary was left with
= 5 u - 4 u
= 1 u

Number of yellow stickers that Mary gave away
= 10 u - 1 u
= 9 u

Fraction of the yellow stickers that Mary gave away = ⁹₁₀

Answer(s): ⁹₁₀