PSLE
Tammy and Hazel folded paper stars over two days. On Thursday, Tammy folded 39 paper stars more than Hazel. On Friday, Tammy folded another 28 paper stars and Hazel folded another 12. At the end of the two days, Tammy made ⁷₉ of the total number of stars. What was the number of paper stars that Hazel folded?

	Tammy	Hazel	Difference
Before	1 u + 39	1 u	39
Change	+ 28	+ 12
After	1 u + 67	1 u + 12	55
Comparing between Tammy and Hazel in the end	7 p	2 p	5 p

Difference between the number of paper stars that Tammy and Hazel folded in the end is repeated.

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

Difference between the number of paper stars that Tammy and Hazel folded in the end
= (1 u + 67) - (1 u + 12)
= 1 u + 67 - 1 u - 12
= 67 - 12
= 55

5 p = 55

1 p = 55 ÷ 5 = 11

Number of paper stars that Hazel folded
= 2 p
= 2 x 11
= 22

Answer(s): 22