PSLE
Sabrina and Sarah folded paper balls over two days. On Thursday, Sabrina folded 26 paper balls more than Sarah. On Friday, Sabrina folded another 34 paper balls and Sarah folded another 18. At the end of the two days, Sabrina made ⁵₇ of the total number of balls. What was the number of paper balls that Sarah folded?

	Sabrina	Sarah	Difference
Before	1 u + 26	1 u	26
Change	+ 34	+ 18
After	1 u + 60	1 u + 18	42
Comparing between Sabrina and Sarah in the end	5 p	2 p	3 p

Difference between the number of paper balls that Sabrina and Sarah folded in the end is repeated.

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

Difference between the number of paper balls that Sabrina and Sarah folded in the end
= (1 u + 60) - (1 u + 18)
= 1 u + 60 - 1 u - 18
= 60 - 18
= 42

3 p = 42

1 p = 42 ÷ 3 = 14

Number of paper balls that Sarah folded
= 2 p
= 2 x 14
= 28

Answer(s): 28