PSLE
Xylia and Natalie folded paper stars over two days. On Monday, Xylia folded 10 paper stars more than Natalie. On Tuesday, Xylia folded another 15 paper stars and Natalie folded another 1. At the end of the two days, Xylia made ⁷₁₀ of the total number of stars. What was the number of paper stars that Natalie folded?

	Xylia	Natalie	Difference
Before	1 u + 10	1 u	10
Change	+ 15	+ 1
After	1 u + 25	1 u + 1	24
Comparing between Xylia and Natalie in the end	7 p	3 p	4 p

Difference between the number of paper stars that Xylia and Natalie folded in the end is repeated.

Difference between the number of paper stars that Xylia and Natalie folded in the end
= 7 p - 3 p
= 4 p

Difference between the number of paper stars that Xylia and Natalie folded in the end
= (1 u + 25) - (1 u + 1)
= 1 u + 25 - 1 u - 1
= 25 - 1
= 24

4 p = 24

1 p = 24 ÷ 4 = 6

Number of paper stars that Natalie folded
= 3 p
= 3 x 6
= 18

Answer(s): 18