PSLE
Xuan and Irene folded paper cranes over two days. On Thursday, Xuan folded 18 paper cranes more than Irene. On Friday, Xuan folded another 11 paper cranes and Irene folded another 7. At the end of the two days, Xuan made ⁵₈ of the total number of cranes. What was the number of paper cranes that Irene folded?

	Xuan	Irene	Difference
Before	1 u + 18	1 u	18
Change	+ 11	+ 7
After	1 u + 29	1 u + 7	22
Comparing between Xuan and Irene in the end	5 p	3 p	2 p

Difference between the number of paper cranes that Xuan and Irene folded in the end is repeated.

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

Difference between the number of paper cranes that Xuan and Irene folded in the end
= (1 u + 29) - (1 u + 7)
= 1 u + 29 - 1 u - 7
= 29 - 7
= 22

2 p = 22

1 p = 22 ÷ 2 = 11

Number of paper cranes that Irene folded
= 3 p
= 3 x 11
= 33

Answer(s): 33