PSLE
Tiffany and Irene folded paper stars over two days. On Tuesday, Tiffany folded 61 paper stars more than Irene. On Wednesday, Tiffany folded another 16 paper stars and Irene folded another 12. At the end of the two days, Tiffany made ⁷₉ of the total number of stars. What was the number of paper stars that Tiffany folded?

	Tiffany	Irene	Difference
Before	1 u + 61	1 u	61
Change	+ 16	+ 12
After	1 u + 77	1 u + 12	65
Comparing between Tiffany and Irene in the end	7 p	2 p	5 p

Difference between the number of paper stars that Tiffany and Irene folded in the end is repeated.

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

Difference between the number of paper stars that Tiffany and Irene folded in the end
= (1 u + 77) - (1 u + 12)
= 1 u + 77 - 1 u - 12
= 77 - 12
= 65

5 p = 65

1 p = 65 ÷ 5 = 13

Number of paper stars that Tiffany folded
= 7 p
= 7 x 13
= 91

Answer(s): 91