PSLE
Esther and Winnie folded paper balls over two days. On Saturday, Esther folded 4 paper balls more than Winnie. On Sunday, Esther folded another 36 paper balls and Winnie folded another 4. At the end of the two days, Esther made ⁵₇ of the total number of balls. What was the number of paper balls that Esther folded?

	Esther	Winnie	Difference
Before	1 u + 4	1 u	4
Change	+ 36	+ 4
After	1 u + 40	1 u + 4	36
Comparing between Esther and Winnie in the end	5 p	2 p	3 p

Difference between the number of paper balls that Esther and Winnie folded in the end is repeated.

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

Difference between the number of paper balls that Esther and Winnie folded in the end
= (1 u + 40) - (1 u + 4)
= 1 u + 40 - 1 u - 4
= 40 - 4
= 36

3 p = 36

1 p = 36 ÷ 3 = 12

Number of paper balls that Esther folded
= 5 p
= 5 x 12
= 60

Answer(s): 60