PSLE
Xuan and Winnie folded paper stars over two days. On Monday, Xuan folded 7 paper stars more than Winnie. On Tuesday, Xuan folded another 15 paper stars and Winnie folded another 4. At the end of the two days, Xuan made ⁵₈ of the total number of stars. What was the number of paper stars that Winnie folded?

	Xuan	Winnie	Difference
Before	1 u + 7	1 u	7
Change	+ 15	+ 4
After	1 u + 22	1 u + 4	18
Comparing between Xuan and Winnie in the end	5 p	3 p	2 p

Difference between the number of paper stars that Xuan and Winnie folded in the end is repeated.

Difference between the number of paper stars that Xuan and Winnie folded in the end
= 5 p - 3 p
= 2 p

Difference between the number of paper stars that Xuan and Winnie folded in the end
= (1 u + 22) - (1 u + 4)
= 1 u + 22 - 1 u - 4
= 22 - 4
= 18

2 p = 18

1 p = 18 ÷ 2 = 9

Number of paper stars that Winnie folded
= 3 p
= 3 x 9
= 27

Answer(s): 27