PSLE
Fanny and Jen folded paper cranes over two days. On Thursday, Fanny folded 28 paper cranes more than Jen. On Friday, Fanny folded another 15 paper cranes and Jen folded another 1. At the end of the two days, Fanny made ⁵₇ of the total number of cranes. What was the number of paper cranes that Jen folded?

	Fanny	Jen	Difference
Before	1 u + 28	1 u	28
Change	+ 15	+ 1
After	1 u + 43	1 u + 1	42
Comparing between Fanny and Jen in the end	5 p	2 p	3 p

Difference between the number of paper cranes that Fanny and Jen folded in the end is repeated.

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

Difference between the number of paper cranes that Fanny and Jen folded in the end
= (1 u + 43) - (1 u + 1)
= 1 u + 43 - 1 u - 1
= 43 - 1
= 42

3 p = 42

1 p = 42 ÷ 3 = 14

Number of paper cranes that Jen folded
= 2 p
= 2 x 14
= 28

Answer(s): 28