PSLE
Jen and Nora folded paper balls over two days. On Thursday, Jen folded 39 paper balls more than Nora. On Friday, Jen folded another 17 paper balls and Nora folded another 14. At the end of the two days, Jen made ⁵₇ of the total number of balls. What was the number of paper balls that Jen folded?

	Jen	Nora	Difference
Before	1 u + 39	1 u	39
Change	+ 17	+ 14
After	1 u + 56	1 u + 14	42
Comparing between Jen and Nora in the end	5 p	2 p	3 p

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

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

Difference between the number of paper balls that Jen and Nora folded in the end
= (1 u + 56) - (1 u + 14)
= 1 u + 56 - 1 u - 14
= 56 - 14
= 42

3 p = 42

1 p = 42 ÷ 3 = 14

Number of paper balls that Jen folded
= 5 p
= 5 x 14
= 70

Answer(s): 70