PSLE
Kimberly and Winnie folded paper stars over two days. On Monday, Kimberly folded 19 paper stars more than Winnie. On Tuesday, Kimberly folded another 23 paper stars and Winnie folded another 2. At the end of the two days, Kimberly made ⁷₉ of the total number of stars. What was the number of paper stars that Kimberly folded?

	Kimberly	Winnie	Difference
Before	1 u + 19	1 u	19
Change	+ 23	+ 2
After	1 u + 42	1 u + 2	40
Comparing between Kimberly and Winnie in the end	7 p	2 p	5 p

Difference between the number of paper stars that Kimberly and Winnie folded in the end is repeated.

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

Difference between the number of paper stars that Kimberly and Winnie folded in the end
= (1 u + 42) - (1 u + 2)
= 1 u + 42 - 1 u - 2
= 42 - 2
= 40

5 p = 40

1 p = 40 ÷ 5 = 8

Number of paper stars that Kimberly folded
= 7 p
= 7 x 8
= 56

Answer(s): 56