PSLE
Wendy and Diana folded paper balls over two days. On Tuesday, Wendy folded 15 paper balls more than Diana. On Wednesday, Wendy folded another 21 paper balls and Diana folded another 12. At the end of the two days, Wendy made ⁵₈ of the total number of balls. What was the number of paper balls that Wendy folded?

	Wendy	Diana	Difference
Before	1 u + 15	1 u	15
Change	+ 21	+ 12
After	1 u + 36	1 u + 12	24
Comparing between Wendy and Diana in the end	5 p	3 p	2 p

Difference between the number of paper balls that Wendy and Diana folded in the end is repeated.

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

Difference between the number of paper balls that Wendy and Diana folded in the end
= (1 u + 36) - (1 u + 12)
= 1 u + 36 - 1 u - 12
= 36 - 12
= 24

2 p = 24

1 p = 24 ÷ 2 = 12

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

Answer(s): 60