PSLE
Kimberly and Zara folded paper balls over two days. On Tuesday, Kimberly folded 32 paper balls more than Zara. On Wednesday, Kimberly folded another 17 paper balls and Zara folded another 4. At the end of the two days, Kimberly made ⁷₉ of the total number of balls. What was the number of paper balls that Zara folded?

	Kimberly	Zara	Difference
Before	1 u + 32	1 u	32
Change	+ 17	+ 4
After	1 u + 49	1 u + 4	45
Comparing between Kimberly and Zara in the end	7 p	2 p	5 p

Difference between the number of paper balls that Kimberly and Zara folded in the end is repeated.

Difference between the number of paper balls that Kimberly and Zara folded in the end
= 7 p - 2 p
= 5 p

Difference between the number of paper balls that Kimberly and Zara folded in the end
= (1 u + 49) - (1 u + 4)
= 1 u + 49 - 1 u - 4
= 49 - 4
= 45

5 p = 45

1 p = 45 ÷ 5 = 9

Number of paper balls that Zara folded
= 2 p
= 2 x 9
= 18

Answer(s): 18