PSLE
Jen and Linda folded paper balls over two days. On Saturday, Jen folded 8 paper balls more than Linda. On Sunday, Jen folded another 35 paper balls and Linda folded another 3. At the end of the two days, Jen made ⁷₉ of the total number of balls. What was the number of paper balls that Linda folded?

	Jen	Linda	Difference
Before	1 u + 8	1 u	8
Change	+ 35	+ 3
After	1 u + 43	1 u + 3	40
Comparing between Jen and Linda in the end	7 p	2 p	5 p

Difference between the number of paper balls that Jen and Linda folded in the end is repeated.

Difference between the number of paper balls that Jen and Linda folded in the end
= 7 p - 2 p
= 5 p

Difference between the number of paper balls that Jen and Linda folded in the end
= (1 u + 43) - (1 u + 3)
= 1 u + 43 - 1 u - 3
= 43 - 3
= 40

5 p = 40

1 p = 40 ÷ 5 = 8

Number of paper balls that Linda folded
= 2 p
= 2 x 8
= 16

Answer(s): 16