PSLE
Natalie and Ivory folded paper balls over two days. On Friday, Natalie folded 17 paper balls more than Ivory. On Saturday, Natalie folded another 24 paper balls and Ivory folded another 2. At the end of the two days, Natalie made ⁵₇ of the total number of balls. What was the number of paper balls that Natalie folded?

	Natalie	Ivory	Difference
Before	1 u + 17	1 u	17
Change	+ 24	+ 2
After	1 u + 41	1 u + 2	39
Comparing between Natalie and Ivory in the end	5 p	2 p	3 p

Difference between the number of paper balls that Natalie and Ivory folded in the end is repeated.

Difference between the number of paper balls that Natalie and Ivory folded in the end
= 5 p - 2 p
= 3 p

Difference between the number of paper balls that Natalie and Ivory folded in the end
= (1 u + 41) - (1 u + 2)
= 1 u + 41 - 1 u - 2
= 41 - 2
= 39

3 p = 39

1 p = 39 ÷ 3 = 13

Number of paper balls that Natalie folded
= 5 p
= 5 x 13
= 65

Answer(s): 65