PSLE
Sarah and Opal folded paper stars over two days. On Saturday, Sarah folded 18 paper stars more than Opal. On Sunday, Sarah folded another 25 paper stars and Opal folded another 17. At the end of the two days, Sarah made ⁵₈ of the total number of stars. What was the number of paper stars that Sarah folded?

	Sarah	Opal	Difference
Before	1 u + 18	1 u	18
Change	+ 25	+ 17
After	1 u + 43	1 u + 17	26
Comparing between Sarah and Opal in the end	5 p	3 p	2 p

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

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

Difference between the number of paper stars that Sarah and Opal folded in the end
= (1 u + 43) - (1 u + 17)
= 1 u + 43 - 1 u - 17
= 43 - 17
= 26

2 p = 26

1 p = 26 ÷ 2 = 13

Number of paper stars that Sarah folded
= 5 p
= 5 x 13
= 65

Answer(s): 65