PSLE
Sarah and Tammy folded paper stars over two days. On Tuesday, Sarah folded 17 paper stars more than Tammy. On Wednesday, Sarah folded another 27 paper stars and Tammy folded another 2. At the end of the two days, Sarah made ⁵₇ of the total number of stars. What was the number of paper stars that Sarah folded?

	Sarah	Tammy	Difference
Before	1 u + 17	1 u	17
Change	+ 27	+ 2
After	1 u + 44	1 u + 2	42
Comparing between Sarah and Tammy in the end	5 p	2 p	3 p

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

Difference between the number of paper stars that Sarah and Tammy folded in the end
= 5 p - 2 p
= 3 p

Difference between the number of paper stars that Sarah and Tammy folded in the end
= (1 u + 44) - (1 u + 2)
= 1 u + 44 - 1 u - 2
= 44 - 2
= 42

3 p = 42

1 p = 42 ÷ 3 = 14

Number of paper stars that Sarah folded
= 5 p
= 5 x 14
= 70

Answer(s): 70