PSLE
Tiffany and Xuan folded paper stars over two days. On Saturday, Tiffany folded 50 paper stars more than Xuan. On Sunday, Tiffany folded another 36 paper stars and Xuan folded another 16. At the end of the two days, Tiffany made ⁷₉ of the total number of stars. What was the number of paper stars that Xuan folded?

	Tiffany	Xuan	Difference
Before	1 u + 50	1 u	50
Change	+ 36	+ 16
After	1 u + 86	1 u + 16	70
Comparing between Tiffany and Xuan in the end	7 p	2 p	5 p

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

Difference between the number of paper stars that Tiffany and Xuan folded in the end
= 7 p - 2 p
= 5 p

Difference between the number of paper stars that Tiffany and Xuan folded in the end
= (1 u + 86) - (1 u + 16)
= 1 u + 86 - 1 u - 16
= 86 - 16
= 70

5 p = 70

1 p = 70 ÷ 5 = 14

Number of paper stars that Xuan folded
= 2 p
= 2 x 14
= 28

Answer(s): 28