PSLE
Esther and Natalie folded paper cranes over two days. On Wednesday, Esther folded 36 paper cranes more than Natalie. On Thursday, Esther folded another 31 paper cranes and Natalie folded another 2. At the end of the two days, Esther made ⁷₉ of the total number of cranes. What was the number of paper cranes that Natalie folded?

	Esther	Natalie	Difference
Before	1 u + 36	1 u	36
Change	+ 31	+ 2
After	1 u + 67	1 u + 2	65
Comparing between Esther and Natalie in the end	7 p	2 p	5 p

Difference between the number of paper cranes that Esther and Natalie folded in the end is repeated.

Difference between the number of paper cranes that Esther and Natalie folded in the end
= 7 p - 2 p
= 5 p

Difference between the number of paper cranes that Esther and Natalie folded in the end
= (1 u + 67) - (1 u + 2)
= 1 u + 67 - 1 u - 2
= 67 - 2
= 65

5 p = 65

1 p = 65 ÷ 5 = 13

Number of paper cranes that Natalie folded
= 2 p
= 2 x 13
= 26

Answer(s): 26